diff --git a/frontend/src/api/accounts.js b/frontend/src/api/accounts.js
index cecdf8e70..13113435d 100644
--- a/frontend/src/api/accounts.js
+++ b/frontend/src/api/accounts.js
@@ -4,7 +4,12 @@ const resource = 'accounts'
 
 export default {
   getAll({ domain, role }) {
-    return repository.get(`/${resource}/`, { params: { domain, role } })
+    return repository.get(`/${resource}/`, {
+      params: { domain, role },
+      paramsSerializer: {
+        indexes: null,
+      },
+    })
   },
   get(accountId) {
     return repository.get(`${resource}/${accountId}/`)
diff --git a/frontend/src/components/admin/domains/DomainAdminList.vue b/frontend/src/components/admin/domains/DomainAdminList.vue
index 6d705e6f4..99077af75 100644
--- a/frontend/src/components/admin/domains/DomainAdminList.vue
+++ b/frontend/src/components/admin/domains/DomainAdminList.vue
@@ -80,6 +80,7 @@
 <script setup>
 import accountApi from '@/api/accounts'
 import domainApi from '@/api/domains'
+import constants from '@/constants.json'
 import { useBusStore } from '@/stores'
 import { useGettext } from 'vue3-gettext'
 import { ref, onMounted } from 'vue'
@@ -128,13 +129,15 @@ function fetchAdministrators(domain) {
 }
 
 function fetchAccounts() {
-  accountApi.getAll({ role: 'DomainAdmins' }).then((resp) => {
-    accounts.value = resp.data.filter(
-      (account) =>
-        administrators.value.find((admin) => admin.id === account.pk) ===
-        undefined
-    )
-  })
+  accountApi
+    .getAll({ role: [constants.RESELLER, constants.DOMAIN_ADMIN] })
+    .then((resp) => {
+      accounts.value = resp.data.filter(
+        (account) =>
+          administrators.value.find((admin) => admin.id === account.pk) ===
+          undefined
+      )
+    })
 }
 function addAdministrator() {
   domainApi
diff --git a/frontend/src/components/admin/domains/DomainEditForm.vue b/frontend/src/components/admin/domains/DomainEditForm.vue
index 852aaf76d..fd63d7c17 100644
--- a/frontend/src/components/admin/domains/DomainEditForm.vue
+++ b/frontend/src/components/admin/domains/DomainEditForm.vue
@@ -138,7 +138,8 @@
         v-if="
           limitsConfig.params &&
           limitsConfig.params.enable_domain_limits &&
-          (authUser.role === 'SuperAdmins' || authUser.role === 'Resellers')
+          (authUser.role === constants.SUPER_ADMIN ||
+            authUser.role === constants.RESELLER)
         "
         value="resourcesForm"
         eager
@@ -184,6 +185,7 @@ import { useGettext } from 'vue3-gettext'
 import { useAuthStore } from '@/stores'
 import { useRouter } from 'vue-router'
 import domainsApi from '@/api/domains'
+import constants from '@/constants.json'
 
 const router = useRouter()
 const { $gettext } = useGettext()
@@ -219,8 +221,8 @@ const formMap = computed(() => {
   if (
     limitsConfig.value.params &&
     limitsConfig.value.params.enable_domain_limits &&
-    (authUser.value.role === 'SuperAdmins' ||
-      authUser.value.role === 'Resellers')
+    (authUser.value.role === constants.SUPER_ADMIN ||
+      authUser.value.role === constants.RESELLER)
   ) {
     map.resourcesForm = resourcesForm
   }
diff --git a/frontend/src/components/admin/identities/AccountCreationForm.vue b/frontend/src/components/admin/identities/AccountCreationForm.vue
index 6f80fc421..63f3544e4 100644
--- a/frontend/src/components/admin/identities/AccountCreationForm.vue
+++ b/frontend/src/components/admin/identities/AccountCreationForm.vue
@@ -68,6 +68,7 @@ import AccountRoleForm from './form_steps/AccountRoleForm.vue'
 import AccountGeneralForm from './form_steps/AccountGeneralForm.vue'
 import AccountMailboxForm from './form_steps/AccountMailboxForm.vue'
 import AccountAliasForm from './form_steps/AccountAliasForm.vue'
+import constants from '@/constants.json'
 
 import { useGettext } from 'vue3-gettext'
 import { ref, computed } from 'vue'
@@ -81,10 +82,7 @@ const domainsStore = useDomainsStore()
 const emit = defineEmits(['close', 'created'])
 
 const needsMailbox = computed(
-  () =>
-    account.value.role !== 'SuperAdmins' &&
-    account.value.username &&
-    account.value.username.indexOf('@') !== -1
+  () => account.value.username && account.value.username.indexOf('@') !== -1
 )
 
 const summarySections = computed(() => {
@@ -187,7 +185,7 @@ const steps = computed(() => {
 const account = ref({
   aliases: [],
   is_active: true,
-  role: 'SimpleUsers',
+  role: constants.USER,
   mailbox: {
     use_domain_quota: true,
   },
@@ -234,19 +232,33 @@ function setFormErrors(step, errors) {
 function preparePayload(payload) {
   const cleaned_payload = { ...payload }
   if (
-    cleaned_payload.role === 'SuperAdmins' &&
+    [constants.RESELLER, constants.SUPER_ADMIN].includes(
+      cleaned_payload.role
+    ) &&
     cleaned_payload.username &&
     cleaned_payload.username.indexOf('@') === -1
   ) {
     delete cleaned_payload.mailbox
   }
-  if (cleaned_payload.mailbox && cleaned_payload.mailbox.message_limit === '') {
-    cleaned_payload.mailbox.message_limit = null
+  if (cleaned_payload.mailbox) {
+    if (cleaned_payload.mailbox.message_limit === '') {
+      cleaned_payload.mailbox.message_limit = null
+    }
+    if (
+      cleaned_payload.mailbox.quota === undefined ||
+      cleaned_payload.mailbox.quota === null
+    ) {
+      cleaned_payload.mailbox.quota = 0
+    }
   }
   return cleaned_payload
 }
 
-function validateAccount() {
+function validateAccount(step) {
+  if (step === 1) {
+    // No validation after role selection
+    return true
+  }
   const payload = preparePayload({ ...account.value })
   return accountsApi.validate(payload)
 }
diff --git a/frontend/src/components/admin/identities/AccountEditForm.vue b/frontend/src/components/admin/identities/AccountEditForm.vue
index d23dbe4ef..340cca65b 100644
--- a/frontend/src/components/admin/identities/AccountEditForm.vue
+++ b/frontend/src/components/admin/identities/AccountEditForm.vue
@@ -209,6 +209,7 @@ import { ref, computed, onMounted, watch } from 'vue'
 import { useGettext } from 'vue3-gettext'
 import { useRoute, useRouter } from 'vue-router'
 import { usePermissions } from '@/composables/permissions'
+import constants from '@/constants.json'
 
 const { $gettext } = useGettext()
 const authStore = useAuthStore()
@@ -229,8 +230,8 @@ const needsResources = computed(() => {
   const isNeeded =
     limitsConfig.value.params &&
     limitsConfig.value.params.enable_admin_limits &&
-    editedAccount.value.role !== 'SimpleUsers' &&
-    editedAccount.value.role !== 'SuperAdmins'
+    editedAccount.value.role !== constants.USER &&
+    editedAccount.value.role !== constants.SUPER_ADMIN
   if (isNeeded === undefined) {
     return false
   }
@@ -285,7 +286,7 @@ async function save() {
     const data = { ...editedAccount.value }
     if (usernameIsEmail.value) {
       data.mailbox.full_address = data.username
-    } else {
+    } else if (data.mailbox) {
       delete data.mailbox.full_address
     }
     if (data.new_password) {
@@ -303,7 +304,7 @@ async function save() {
       if (editedAccount.value.pk === authStore.authUser.pk) {
         data.role = authStore.authUser.role
       } else {
-        data.role = 'SimpleUsers'
+        data.role = constants.USER
       }
     }
     await accountsApi.patch(editedAccount.value.pk, data)
diff --git a/frontend/src/components/admin/identities/AccountSummary.vue b/frontend/src/components/admin/identities/AccountSummary.vue
index a7c0d8553..03ee1ffcd 100644
--- a/frontend/src/components/admin/identities/AccountSummary.vue
+++ b/frontend/src/components/admin/identities/AccountSummary.vue
@@ -50,7 +50,7 @@
           <v-col v-else cols="6">
             <v-progress-linear
               :color="account.mailbox.quota_usage < 80 ? 'primary' : 'warning'"
-              :value="account.mailbox.quota_usage"
+              :model-value="account.mailbox.quota_usage"
               height="25"
               class="white--text"
             >
diff --git a/frontend/src/components/admin/identities/form_steps/AccountGeneralForm.vue b/frontend/src/components/admin/identities/form_steps/AccountGeneralForm.vue
index 245d90501..552975d78 100644
--- a/frontend/src/components/admin/identities/form_steps/AccountGeneralForm.vue
+++ b/frontend/src/components/admin/identities/form_steps/AccountGeneralForm.vue
@@ -57,6 +57,7 @@ import { ref, computed } from 'vue'
 import { useGettext } from 'vue3-gettext'
 import { useAuthStore } from '@/stores'
 import rules from '@/plugins/rules'
+import constants from '@/constants.json'
 
 const { $gettext } = useGettext()
 const authStore = useAuthStore()
@@ -72,21 +73,18 @@ const formErrors = ref({})
 const account = computed(() => props.modelValue)
 
 const usernamePlaceholder = computed(() => {
-  if (account.value.role === 'SimpleUsers') {
+  if (account.value.role === constants.USER) {
     return $gettext('Enter an email address')
   }
   return $gettext('Enter a simple username or an email address')
 })
 
 const usernameInputType = computed(() => {
-  return account.value.role === 'SimpleUsers' ? 'email' : 'text'
+  return account.value.role === constants.USER ? 'email' : 'text'
 })
 
 function updateUsername() {
-  if (
-    account.value.role != 'SuperAdmins' &&
-    account.value.username.indexOf('@') !== -1
-  ) {
+  if (account.value.username.indexOf('@') !== -1) {
     account.value.mailbox.full_address = account.value.username
     account.value.mailbox.message_limit = null
   }
diff --git a/frontend/src/components/admin/identities/form_steps/AccountMailboxForm.vue b/frontend/src/components/admin/identities/form_steps/AccountMailboxForm.vue
index ef5a781a5..e616854a4 100644
--- a/frontend/src/components/admin/identities/form_steps/AccountMailboxForm.vue
+++ b/frontend/src/components/admin/identities/form_steps/AccountMailboxForm.vue
@@ -44,11 +44,12 @@
   </v-form>
 </template>
 
-<script setup lang="js">
+<script setup>
 import { ref, computed, watch } from 'vue'
 import { useGettext } from 'vue3-gettext'
 import { useDomainsStore } from '@/stores'
 import rules from '@/plugins/rules'
+import constants from '@/constants.json'
 
 const { $gettext } = useGettext()
 const emit = defineEmits(['update:modelValue'])
@@ -68,7 +69,7 @@ watch(
   (value) => {
     if (value) {
       form.value = { ...value }
-      if (form.value.role === 'SimpleUsers') {
+      if (form.value.role === constants.USER) {
         if (!form.value.mailbox) {
           form.value.mailbox = {}
         }
diff --git a/frontend/src/components/admin/identities/form_steps/AccountRoleForm.vue b/frontend/src/components/admin/identities/form_steps/AccountRoleForm.vue
index fd684a932..d6f285b6e 100644
--- a/frontend/src/components/admin/identities/form_steps/AccountRoleForm.vue
+++ b/frontend/src/components/admin/identities/form_steps/AccountRoleForm.vue
@@ -25,11 +25,12 @@
   </v-form>
 </template>
 
-<script setup lang="js">
+<script setup>
 import ChoiceField from '@/components/tools/ChoiceField'
 import { computed, ref } from 'vue'
 import { useAuthStore } from '@/stores'
 import { useGettext } from 'vue3-gettext'
+import constants from '@/constants.json'
 
 const authStore = useAuthStore()
 const { $gettext } = useGettext()
@@ -59,16 +60,16 @@ const roleHelp = computed(() => {
 })
 
 const accountRoles = computed(() => {
-  if (authUser.value.role === 'SuperAdmins') {
+  if (authUser.value.role === constants.SUPER_ADMIN) {
     return [
+      ...simpleUserRole,
       ...domainAdminsRole,
       ...resellerRole,
-      ...simpleUserRole,
       ...superAdminsRole,
     ]
-  } else if (authUser.value.role === 'DomainAdmins') {
+  } else if (authUser.value.role === constants.DOMAIN_ADMIN) {
     return [...simpleUserRole]
-  } else if (authUser.value.role === 'Resellers') {
+  } else if (authUser.value.role === constants.RESELLER) {
     return [...domainAdminsRole, ...simpleUserRole]
   } else {
     return []
@@ -78,7 +79,7 @@ const accountRoles = computed(() => {
 const simpleUserRole = [
   {
     label: $gettext('Simple user'),
-    value: 'SimpleUsers',
+    value: constants.USER,
     help: $gettext(
       'A user with no privileges but with a mailbox. He will be allowed to use all end-user features: webmail, calendar, contacts, filters.'
     ),
@@ -88,7 +89,7 @@ const simpleUserRole = [
 const domainAdminsRole = [
   {
     label: $gettext('Domain administrator'),
-    value: 'DomainAdmins',
+    value: constants.DOMAIN_ADMIN,
     help: $gettext(
       'A user with privileges on one or more domain. He will be allowed to administer mailboxes and he can also have a mailbox.'
     ),
@@ -97,14 +98,16 @@ const domainAdminsRole = [
 const resellerRole = [
   {
     label: $gettext('Reseller'),
-    value: 'Resellers',
-    help: $gettext('help'),
+    value: constants.RESELLER,
+    help: $gettext(
+      'An intermediate user who has the same privileges than a Domain administrator, plus the possibility to create domains and to assign resources.'
+    ),
   },
 ]
 const superAdminsRole = [
   {
     label: $gettext('Super administrator'),
-    value: 'SuperAdmins',
+    value: constants.SUPER_ADMIN,
     help: $gettext(
       "A user with all privileges, can do anything. By default, such a user does not have a mailbox so he can't access end-user features."
     ),
diff --git a/frontend/src/components/shared/NavBar.vue b/frontend/src/components/shared/NavBar.vue
index 6cc5c4a59..18b98d915 100644
--- a/frontend/src/components/shared/NavBar.vue
+++ b/frontend/src/components/shared/NavBar.vue
@@ -94,6 +94,7 @@
 import { useRouter } from 'vue-router'
 import { ref, computed, onMounted } from 'vue'
 import { useGlobalStore, useAuthStore, useLayoutStore } from '@/stores'
+import constants from '@/constants.json'
 
 const props = defineProps({
   color: {
@@ -141,7 +142,7 @@ function displayMenuItem(item) {
 }
 
 onMounted(() => {
-  if (authUser.value.role === 'SuperAdmins') {
+  if (authUser.value.role === constants.SUPER_ADMIN) {
     globalStore.fetchNotifications()
   }
 })
diff --git a/frontend/src/components/tools/ChoiceField.vue b/frontend/src/components/tools/ChoiceField.vue
index f4dd5ce24..7ca308ad0 100644
--- a/frontend/src/components/tools/ChoiceField.vue
+++ b/frontend/src/components/tools/ChoiceField.vue
@@ -8,7 +8,7 @@
   <div
     v-for="(lineChoices, index1) in formatedChoices"
     :key="index1"
-    class="d-flex"
+    class="d-flex flex-grow-0"
   >
     <div
       v-for="(choice, index2) in lineChoices"
diff --git a/frontend/src/components/tools/CreationForm.vue b/frontend/src/components/tools/CreationForm.vue
index fad407657..c828a49a4 100644
--- a/frontend/src/components/tools/CreationForm.vue
+++ b/frontend/src/components/tools/CreationForm.vue
@@ -150,7 +150,7 @@ async function goToNextStep(current, next) {
     }
     if (props.validateObject) {
       try {
-        await props.validateObject()
+        await props.validateObject(current)
       } catch (error) {
         emit('validationError', current, error.response.data)
         return
diff --git a/frontend/src/components/tools/EmailField.vue b/frontend/src/components/tools/EmailField.vue
index 79fd3c131..5f9c582b8 100644
--- a/frontend/src/components/tools/EmailField.vue
+++ b/frontend/src/components/tools/EmailField.vue
@@ -25,17 +25,16 @@
   </div>
 </template>
 
-<script setup lang="js">
+<script setup>
 import { ref, computed, onMounted, onUnmounted, onUpdated, nextTick } from 'vue'
 import { useDomainsStore } from '@/stores'
-import { useGettext } from 'vue3-gettext'
+import constants from '@/constants.json'
 
-const { $gettext } = useGettext()
 const domainsStore = useDomainsStore()
 const props = defineProps({
   modelValue: { type: String, default: '' },
   allowAdd: { type: Boolean, default: false },
-  role: { type: String, default: 'SimpleUsers' },
+  role: { type: String, default: constants.USER },
   errorMsg: { type: Array, default: () => [] },
 })
 const emit = defineEmits(['domain-selected', 'update:model-value'])
@@ -47,15 +46,11 @@ const input = computed({
   set(value) {
     errors.value = []
     if (value.indexOf('@') !== -1) {
-      if (props.role !== 'SuperAdmins') {
-        domainSearch.value = value.split('@')[1]
-        if (props.allowAdd) {
-          showMenu.value = filteredDomains.value.length > 0
-        } else {
-          showMenu.value = true
-        }
+      domainSearch.value = value.split('@')[1]
+      if (props.allowAdd) {
+        showMenu.value = filteredDomains.value.length > 0
       } else {
-        errors.value = [$gettext('SuperAdmins cannot own a mailbox')]
+        showMenu.value = true
       }
     } else {
       showMenu.value = false
@@ -87,10 +82,6 @@ const inputRef = ref()
 const localErrors = ref([])
 
 function onKeyDown(e) {
-  if (props.role === 'SuperAdmins') {
-    // No mailbox for SuperAdmins
-    return
-  }
   const keyCode = e.keyCode
   if (keyCode === 40 || keyCode === 34) {
     // on arrow down or page down
diff --git a/frontend/src/components/tools/ResourcesView.vue b/frontend/src/components/tools/ResourcesView.vue
index a28092972..a1c7ffa96 100644
--- a/frontend/src/components/tools/ResourcesView.vue
+++ b/frontend/src/components/tools/ResourcesView.vue
@@ -5,21 +5,40 @@
     </v-card-title>
     <v-card-text>
       <div v-for="resource in resources" :key="resource.name" class="mt-4">
-        {{ resource.label }} ({{ Math.ceil(resource.usage) }}%)
-        <v-progress-linear
-          :value="resource.usage"
-          :color="getProgressColor(resource.usage)"
-        />
+        <template v-if="resource.max_value === -1">
+          {{ resource.label }} ({{ $gettext('Unlimited') }})
+        </template>
+        <template v-else-if="resource.max_value === 0">
+          {{ resource.label }} ({{ noLimitLabel(resource) }})
+        </template>
+        <template v-else>
+          {{ resource.label }} ({{ Math.ceil(resource.usage) }}%)
+          <v-progress-linear
+            :model-value="resource.usage"
+            :color="getProgressColor(resource.usage)"
+          />
+        </template>
       </div>
     </v-card-text>
   </v-card>
 </template>
 
-<script setup lang="js">
+<script setup>
+import { useGettext } from 'vue3-gettext'
+
 defineProps({
   resources: { type: Array, default: null },
 })
 
+const { $gettext } = useGettext()
+
+const noLimitLabel = (resource) => {
+  if (resource.name === 'quota') {
+    return $gettext('No quota')
+  }
+  return $gettext('Creation denied')
+}
+
 function getProgressColor(value) {
   if (value < 50) {
     return 'primary'
diff --git a/frontend/src/composables/permissions.js b/frontend/src/composables/permissions.js
index 25ac599b9..350dd93be 100644
--- a/frontend/src/composables/permissions.js
+++ b/frontend/src/composables/permissions.js
@@ -1,15 +1,20 @@
 import { computed } from 'vue'
 import { useAuthStore } from '@/stores'
+import constants from '@/constants.json'
 
 export function usePermissions() {
   const authStore = useAuthStore()
 
   const canSetRole = computed(() => {
-    return ['Resellers', 'SuperAdmins'].includes(authStore.authUser.role)
+    return [constants.RESELLER, constants.SUPER_ADMIN].includes(
+      authStore.authUser.role
+    )
   })
 
   const canAddDomain = computed(() => {
-    return ['Resellers', 'SuperAdmins'].includes(authStore.authUser.role)
+    return [constants.RESELLER, constants.SUPER_ADMIN].includes(
+      authStore.authUser.role
+    )
   })
 
   return {
diff --git a/frontend/src/constants.json b/frontend/src/constants.json
index b689aec6b..7b4066720 100644
--- a/frontend/src/constants.json
+++ b/frontend/src/constants.json
@@ -1,4 +1,8 @@
 {
-  "ALARM_OPENED": 1,
-  "ALARM_CLOSED": 2
+    "ALARM_OPENED": 1,
+    "ALARM_CLOSED": 2,
+    "SUPER_ADMIN": "SuperAdmins",
+    "RESELLER": "Resellers",
+    "DOMAIN_ADMIN": "DomainAdmins",
+    "USER": "SimpleUsers"
 }
diff --git a/frontend/src/layouts/admin/AdminLayout.vue b/frontend/src/layouts/admin/AdminLayout.vue
index 09b7cb640..a2fd1f91d 100644
--- a/frontend/src/layouts/admin/AdminLayout.vue
+++ b/frontend/src/layouts/admin/AdminLayout.vue
@@ -9,6 +9,7 @@ import { useAuthStore, useParametersStore } from '@/stores'
 import parametersApi from '@/api/parameters'
 import capabilitiesApi from '@/api/capabilities'
 import ConnectedLayout from '@/layouts/connected/ConnectedLayout.vue'
+import constants from '@/constants.json'
 
 const { $gettext } = useGettext()
 const authStore = useAuthStore()
@@ -38,13 +39,13 @@ const adminMenuItems = [
     text: $gettext('Domains'),
     to: { name: 'DomainList' },
     icon: 'mdi-domain',
-    roles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+    roles: [constants.DOMAIN_ADMIN, constants.RESELLER, constants.SUPER_ADMIN],
   },
   {
     text: $gettext('Identities'),
     to: { name: 'Identities' },
     icon: 'mdi-account',
-    roles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+    roles: [constants.DOMAIN_ADMIN, constants.RESELLER, constants.SUPER_ADMIN],
   },
   {
     text: $gettext('Alarms'),
@@ -54,40 +55,44 @@ const adminMenuItems = [
   {
     icon: 'mdi-history',
     text: $gettext('Monitoring'),
-    roles: ['SuperAdmins', 'Resellers', 'DomainAdmins'],
+    roles: [constants.SUPER_ADMIN, constants.RESELLER, constants.DOMAIN_ADMIN],
     children: [
       {
         text: $gettext('Statistics'),
         to: { name: 'Statistics' },
-        roles: ['SuperAdmins'],
+        roles: [constants.SUPER_ADMIN],
       },
       {
         text: $gettext('Audit trail'),
         to: { name: 'AuditTrail' },
-        roles: ['SuperAdmins'],
+        roles: [constants.SUPER_ADMIN],
       },
       {
         text: $gettext('Messages'),
         to: { name: 'MessageLog' },
-        roles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+        roles: [
+          constants.DOMAIN_ADMIN,
+          constants.RESELLER,
+          constants.SUPER_ADMIN,
+        ],
       },
     ],
   },
   {
     icon: 'mdi-email-sync-outline',
     text: $gettext('IMAP Migration'),
-    roles: ['SuperAdmins', 'Resellers'],
+    roles: [constants.SUPER_ADMIN, constants.RESELLER],
     condition: () => imapMigrationEnabled.value,
     children: [
       {
         text: $gettext('Email providers'),
         to: { name: 'ProvidersList' },
-        roles: ['SuperAdmins', 'Resellers'],
+        roles: [constants.SUPER_ADMIN, constants.RESELLER],
       },
       {
         text: $gettext('Migrations'),
         to: { name: 'MigrationsList' },
-        roles: ['Resellers', 'SuperAdmins'],
+        roles: [constants.RESELLER, constants.SUPER_ADMIN],
       },
     ],
   },
@@ -95,26 +100,26 @@ const adminMenuItems = [
     icon: 'mdi-cog',
     text: $gettext('Settings'),
     children: settings,
-    roles: ['SuperAdmins'],
+    roles: [constants.SUPER_ADMIN],
   },
   {
     icon: 'mdi-email-check-outline',
     text: 'Rspamd',
     action: openRspamdDashboard,
-    roles: ['SuperAdmins'],
+    roles: [constants.SUPER_ADMIN],
     condition: () => isRspamdVisible.value,
   },
   {
     icon: 'mdi-information',
     text: $gettext('Information'),
-    roles: ['SuperAdmins'],
+    roles: [constants.SUPER_ADMIN],
     to: { name: 'Information' },
     withBell: true,
   },
 ]
 
 onMounted(() => {
-  if (authUser.value.role === 'SuperAdmins') {
+  if (authUser.value.role === constants.SUPER_ADMIN) {
     parametersApi.getGlobalApplications().then((response) => {
       response.data.forEach((item) => {
         settings.push({
diff --git a/frontend/src/plugins/permissions.js b/frontend/src/plugins/permissions.js
index 438495aa1..f4105f092 100644
--- a/frontend/src/plugins/permissions.js
+++ b/frontend/src/plugins/permissions.js
@@ -1,4 +1,5 @@
 import { useAuthStore } from '@/stores'
+import constants from '@/constants.json'
 
 export default {
   install: (app) => {
@@ -8,7 +9,7 @@ export default {
       const permission = binding.value
       if (authStore.authUser) {
         if (
-          authUser.authUser.role !== 'SuperAdmins' &&
+          authUser.authUser.role !== constants.SUPER_ADMIN &&
           authStore.authUser.permissions.indexOf(permission) === -1
         ) {
           el.style.display = 'none'
@@ -21,7 +22,7 @@ export default {
         return false
       }
       if (
-        authStore.authUser.role === 'SuperAdmins' ||
+        authStore.authUser.role === constants.SUPER_ADMIN ||
         authStore.authUser.permissions.indexOf(permission) !== -1
       ) {
         return true
diff --git a/frontend/src/router/index.js b/frontend/src/router/index.js
index c11c7c43f..f0bd9457f 100644
--- a/frontend/src/router/index.js
+++ b/frontend/src/router/index.js
@@ -1,6 +1,6 @@
-// Composables
 import { createRouter, createWebHistory } from 'vue-router'
 import { useAuthStore } from '@/stores'
+import constants from '@/constants.json'
 
 const routes = [
   {
@@ -26,7 +26,11 @@ const routes = [
     path: '/admin',
     component: () => import('@/layouts/admin/AdminLayout.vue'),
     meta: {
-      allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+      allowedRoles: [
+        constants.DOMAIN_ADMIN,
+        constants.RESELLER,
+        constants.SUPER_ADMIN,
+      ],
     },
     children: [
       {
@@ -42,7 +46,11 @@ const routes = [
         component: () => import('@/layouts/empty/EmptyLayout.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+          allowedRoles: [
+            constants.DOMAIN_ADMIN,
+            constants.RESELLER,
+            constants.SUPER_ADMIN,
+          ],
         },
         children: [
           {
@@ -51,7 +59,11 @@ const routes = [
             component: () => import('@/views/admin/domains/DomainsView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
           {
@@ -59,7 +71,11 @@ const routes = [
             name: 'DomainDetail',
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
             component: () => import('@/views/admin/domains/DomainView.vue'),
           },
@@ -68,7 +84,11 @@ const routes = [
             name: 'DomainEdit',
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
             component: () => import('@/views/admin/domains/DomainEditView.vue'),
           },
@@ -79,7 +99,11 @@ const routes = [
         component: () => import('@/layouts/empty/EmptyLayout.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+          allowedRoles: [
+            constants.DOMAIN_ADMIN,
+            constants.RESELLER,
+            constants.SUPER_ADMIN,
+          ],
         },
         children: [
           {
@@ -89,7 +113,7 @@ const routes = [
               import('@/views/admin/imap_migration/MigrationsView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['Resellers', 'SuperAdmins'],
+              allowedRoles: [constants.RESELLER, constants.SUPER_ADMIN],
             },
           },
           {
@@ -97,7 +121,7 @@ const routes = [
             component: () => import('@/layouts/empty/EmptyLayout.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['Resellers', 'SuperAdmins'],
+              allowedRoles: [constants.RESELLER, constants.SUPER_ADMIN],
             },
             children: [
               {
@@ -107,7 +131,7 @@ const routes = [
                   import('@/views/admin/imap_migration/ProvidersView.vue'),
                 meta: {
                   requiresAuth: true,
-                  allowedRoles: ['Resellers', 'SuperAdmins'],
+                  allowedRoles: [constants.RESELLER, constants.SUPER_ADMIN],
                 },
               },
               {
@@ -117,7 +141,7 @@ const routes = [
                   import('@/views/admin/imap_migration/ProviderEditView.vue'),
                 meta: {
                   requiresAuth: true,
-                  allowedRoles: ['Resellers', 'SuperAdmins'],
+                  allowedRoles: [constants.RESELLER, constants.SUPER_ADMIN],
                 },
               },
             ],
@@ -129,7 +153,11 @@ const routes = [
         component: () => import('@/layouts/empty/EmptyLayout.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+          allowedRoles: [
+            constants.DOMAIN_ADMIN,
+            constants.RESELLER,
+            constants.SUPER_ADMIN,
+          ],
         },
         children: [
           {
@@ -139,7 +167,11 @@ const routes = [
               import('@/views/admin/identities/IdentitiesView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
           {
@@ -148,7 +180,11 @@ const routes = [
             component: () => import('@/views/admin/identities/AccountView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
           {
@@ -158,7 +194,11 @@ const routes = [
               import('@/views/admin/identities/AccountEditView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
           {
@@ -167,7 +207,11 @@ const routes = [
             component: () => import('@/views/admin/identities/AliasView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
           {
@@ -177,7 +221,11 @@ const routes = [
               import('@/views/admin/identities/AliasEditView.vue'),
             meta: {
               requiresAuth: true,
-              allowedRoles: ['DomainAdmins', 'Resellers', 'SuperAdmins'],
+              allowedRoles: [
+                constants.DOMAIN_ADMIN,
+                constants.RESELLER,
+                constants.SUPER_ADMIN,
+              ],
             },
           },
         ],
@@ -188,7 +236,7 @@ const routes = [
         component: () => import('@/views/admin/ParametersView.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['SuperAdmins'],
+          allowedRoles: [constants.SUPER_ADMIN],
         },
       },
       {
@@ -205,7 +253,7 @@ const routes = [
         component: () => import('@/views/admin/monitoring/StatisticsView.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['SuperAdmins'],
+          allowedRoles: [constants.SUPER_ADMIN],
         },
       },
       {
@@ -214,7 +262,7 @@ const routes = [
         component: () => import('@/views/admin/monitoring/AuditTrailView.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['SuperAdmins'],
+          allowedRoles: [constants.SUPER_ADMIN],
         },
       },
       {
@@ -223,7 +271,7 @@ const routes = [
         component: () => import('@/views/admin/monitoring/MessagesView.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['DomainAdmins', 'SuperAdmins'],
+          allowedRoles: [constants.DOMAIN_ADMIN, constants.SUPER_ADMIN],
         },
       },
       {
@@ -232,7 +280,7 @@ const routes = [
         component: () => import('@/views/admin/InformationView.vue'),
         meta: {
           requiresAuth: true,
-          allowedRoles: ['SuperAdmins'],
+          allowedRoles: [constants.SUPER_ADMIN],
         },
       },
     ],
diff --git a/frontend/src/views/account/SettingsView.vue b/frontend/src/views/account/SettingsView.vue
index 1c2047581..602ba8015 100644
--- a/frontend/src/views/account/SettingsView.vue
+++ b/frontend/src/views/account/SettingsView.vue
@@ -16,7 +16,10 @@
       <v-tab v-if="authStore.userHasMailbox" value="autoreply">
         {{ $gettext('Auto-reply message') }}
       </v-tab>
-      <v-tab v-if="authStore.authUser.role === 'SuperAdmins'" value="api">
+      <v-tab
+        v-if="authStore.authUser.role === constants.SUPER_ADMIN"
+        value="api"
+      >
         {{ $gettext('API access') }}
       </v-tab>
     </v-tabs>
@@ -36,7 +39,7 @@
         <AutoReplyForm />
       </v-tabs-window-item>
       <v-tabs-window-item
-        v-if="authStore.authUser.role === 'SuperAdmins'"
+        v-if="authStore.authUser.role === constants.SUPER_ADMIN"
         value="api"
       >
         <APISetupForm />
@@ -55,6 +58,7 @@ import AutoReplyForm from '@/components/account/AutoReplyForm.vue'
 import APISetupForm from '@/components/account/APISetupForm.vue'
 import FidoAuthForm from '@/components/account/FidoAuthForm.vue'
 import { useAuthStore } from '@/stores'
+import constants from '@/constants.json'
 
 const authStore = useAuthStore()
 const tab = ref()
diff --git a/frontend/src/views/admin/identities/AccountView.vue b/frontend/src/views/admin/identities/AccountView.vue
index e60006a69..5f0a49155 100644
--- a/frontend/src/views/admin/identities/AccountView.vue
+++ b/frontend/src/views/admin/identities/AccountView.vue
@@ -14,7 +14,7 @@
     <v-col cols="6">
       <AccountSummary :account="account" />
       <DomainAdminDomains
-        v-if="account.role === 'DomainAdmins'"
+        v-if="account.role === constants.DOMAIN_ADMIN"
         class="mt-2"
         :account="account"
       />
@@ -24,8 +24,8 @@
         v-if="
           limitsConfig.params &&
           limitsConfig.params.enable_admin_limits &&
-          account.role !== 'SimpleUsers' &&
-          account.role !== 'SuperAdmins'
+          account.role !== constants.USER &&
+          account.role !== constants.SUPER_ADMIN
         "
         :resources="account.resources"
       />
@@ -40,7 +40,7 @@
 </template>
 
 <script setup lang="js">
-import { ref, computed } from 'vue'
+import { ref } from 'vue'
 import { useRoute } from 'vue-router'
 import { usePermissions } from '@/composables/permissions'
 import accountsApi from '@/api/accounts'
@@ -50,6 +50,7 @@ import AccountSenderAddresses from '@/components/admin/identities/AccountSenderA
 import AccountSummary from '@/components/admin/identities/AccountSummary.vue'
 import DomainAdminDomains from '@/components/admin/identities/DomainAdminDomains.vue'
 import ResourcesView from '@/components/tools/ResourcesView.vue'
+import constants from '@/constants.json'
 
 const route = useRoute()
 const { canSetRole } = usePermissions()
diff --git a/modoboa/admin/api/v2/viewsets.py b/modoboa/admin/api/v2/viewsets.py
index eee469d39..fa2460735 100644
--- a/modoboa/admin/api/v2/viewsets.py
+++ b/modoboa/admin/api/v2/viewsets.py
@@ -19,7 +19,7 @@ from rest_framework.decorators import action
 from rest_framework.exceptions import PermissionDenied
 
 from modoboa.admin.api.v1 import viewsets as v1_viewsets
-from modoboa.core import models as core_models
+from modoboa.core import constants as core_constants, models as core_models
 from modoboa.lib import pagination
 from modoboa.lib import renderers as lib_renderers
 from modoboa.lib import viewsets as lib_viewsets
@@ -153,14 +153,16 @@ class AccountFilterSet(dj_filters.FilterSet):
         queryset=lambda request: models.Domain.objects.get_for_admin(request.user),
         field_name="mailbox__domain",
     )
-    role = dj_filters.CharFilter(method="filter_role")
+    role = dj_filters.MultipleChoiceFilter(
+        choices=core_constants.ROLES, method="filter_role"
+    )
 
     class Meta:
         model = core_models.User
         fields = ["domain", "role"]
 
     def filter_role(self, queryset, name, value):
-        return queryset.filter(groups__name=value)
+        return queryset.filter(groups__name__in=value)
 
 
 class AccountViewSet(v1_viewsets.AccountViewSet):
diff --git a/modoboa/lib/permissions.py b/modoboa/lib/permissions.py
index ddc5ba9eb..41aa02099 100644
--- a/modoboa/lib/permissions.py
+++ b/modoboa/lib/permissions.py
@@ -152,3 +152,10 @@ class IsSuperUser(permissions.BasePermission):
 
     def has_permission(self, request, view):
         return request.user.is_superuser
+
+
+class CanCreateDomain(permissions.BasePermission):
+    """Permissions class to allow users with add_domain right."""
+
+    def has_permission(self, request, view):
+        return request.user.has_perm("admin.add_domain")
diff --git a/modoboa/parameters/api/v2/viewsets.py b/modoboa/parameters/api/v2/viewsets.py
index 4bc2ec732..1ecc56668 100644
--- a/modoboa/parameters/api/v2/viewsets.py
+++ b/modoboa/parameters/api/v2/viewsets.py
@@ -4,7 +4,7 @@ from drf_spectacular.utils import extend_schema, OpenApiParameter
 from rest_framework import permissions, response, viewsets
 from rest_framework.decorators import action
 
-from modoboa.lib.permissions import IsSuperUser
+from modoboa.lib.permissions import CanCreateDomain, IsSuperUser
 from modoboa.lib.throttle import GetThrottleViewsetMixin
 
 from . import serializers
@@ -90,7 +90,11 @@ class GlobalParametersViewSet(BaseParametersViewSet):
     """Parameter viewset, global level."""
 
     level = "global"
-    permission_classes = [permissions.IsAuthenticated, IsSuperUser]
+
+    def get_permissions(self):
+        if self.action == "retrieve":
+            return [permissions.IsAuthenticated(), CanCreateDomain()]
+        return [permissions.IsAuthenticated(), IsSuperUser()]
 
     def _get_parameter_values(self, request, app: str) -> dict:
         return request.localconfig.parameters.get_values_dict(app)