diff --git a/frontend/src/locale/ja_JP/app.po b/frontend/src/locale/ja_JP/app.po
index 212a2e6a2..7335012fd 100644
--- a/frontend/src/locale/ja_JP/app.po
+++ b/frontend/src/locale/ja_JP/app.po
@@ -1,4 +1,3 @@
-# 
 # Translators:
 # Antoine Nguyen <tonio@ngyn.org>, 2025
 # INOUE Daisuke, 2026
@@ -54,7 +53,7 @@ msgstr "API トークンを作成しました"
 
 #: src/components/account/APISetupForm.vue:94
 #: src/components/account/FidoAuthForm.vue:184
-#: src/components/admin/domains/DNSDetail.vue:258
+#: src/components/admin/domains/DNSDetail.vue:265
 #: src/components/admin/domains/DomainList.vue:300
 #: src/components/admin/identities/IdentityList.vue:482
 #: src/components/admin/identities/IdentityList.vue:522
@@ -109,7 +108,7 @@ msgstr "有効"
 #: src/components/account/AutoReplyForm.vue:12
 #: src/components/quarantine/QuarantineList.vue:49
 #: src/components/quarantine/QuarantineList.vue:235
-#: src/components/webmail/ComposeEmailForm.vue:158
+#: src/components/webmail/ComposeEmailForm.vue:166
 msgid "Subject"
 msgstr "件名"
 
@@ -130,7 +129,7 @@ msgstr ""
 #: src/components/calendars/EventForm.vue:24
 #: src/components/quarantine/QuarantineList.vue:234
 #: src/components/tools/TimeSerieChart.vue:19
-#: src/components/webmail/ComposeEmailForm.vue:48
+#: src/components/webmail/ComposeEmailForm.vue:56
 msgid "From"
 msgstr "差出人"
 
@@ -220,7 +219,7 @@ msgstr "名前"
 #: src/components/account/FidoAuthForm.vue:130
 #: src/components/account/FilterForm.vue:7
 #: src/components/account/FilterSetForm.vue:9
-#: src/components/admin/domains/DNSDetail.vue:188
+#: src/components/admin/domains/DNSDetail.vue:195
 #: src/components/admin/domains/DomainAdminList.vue:112
 #: src/components/admin/domains/DomainAliasForm.vue:8
 #: src/components/admin/domains/DomainCreationForm.vue:164
@@ -274,8 +273,8 @@ msgid "Do you really want to delete this WebAuthn device?"
 msgstr "このパスキーデバイスを削除します。よろしいですか？"
 
 #: src/components/account/FidoAuthForm.vue:188
-#: src/components/admin/domains/DNSDetail.vue:244
-#: src/components/admin/domains/DNSDetail.vue:264
+#: src/components/admin/domains/DNSDetail.vue:251
+#: src/components/admin/domains/DNSDetail.vue:271
 #: src/components/admin/domains/DomainList.vue:306
 #: src/components/admin/identities/IdentityList.vue:487
 #: src/components/admin/identities/IdentityList.vue:527
@@ -285,8 +284,8 @@ msgid "No"
 msgstr "いいえ"
 
 #: src/components/account/FidoAuthForm.vue:189
-#: src/components/admin/domains/DNSDetail.vue:245
-#: src/components/admin/domains/DNSDetail.vue:265
+#: src/components/admin/domains/DNSDetail.vue:252
+#: src/components/admin/domains/DNSDetail.vue:272
 #: src/components/admin/domains/DomainList.vue:307
 #: src/components/admin/identities/IdentityList.vue:486
 #: src/components/admin/identities/IdentityList.vue:526
@@ -538,7 +537,7 @@ msgstr "例えばスマートフォンを無くしてしまったなどの事態
 #: src/components/webmail/EmailSchedulingForm.vue:28
 #: src/components/webmail/MailboxForm.vue:29
 #: src/layouts/connected/ConnectedLayout.vue:19
-#: src/views/webmail/EmailView.vue:158
+#: src/views/webmail/EmailView.vue:167
 msgid "Close"
 msgstr "閉じる"
 
@@ -788,82 +787,86 @@ msgstr "現在、%{ address } の IP アドレスが以下の DNSBL に掲載さ
 msgid "DNS configuration help"
 msgstr "DNS 設定のヘルプ"
 
-#: src/components/admin/domains/DNSDetail.vue:20
-#: src/components/admin/domains/DNSDetail.vue:51
+#: src/components/admin/domains/DNSDetail.vue:17
+msgid "Last check:"
+msgstr "最終確認 : "
+
+#: src/components/admin/domains/DNSDetail.vue:27
+#: src/components/admin/domains/DNSDetail.vue:58
 #: src/components/admin/domains/DNSStatusChip.vue:21
 msgid "Pending"
 msgstr "保留"
 
-#: src/components/admin/domains/DNSDetail.vue:46
+#: src/components/admin/domains/DNSDetail.vue:53
 #: src/components/admin/domains/DomainDNSConfig.vue:71
 msgid "Auto configuration"
 msgstr "自動構成"
 
-#: src/components/admin/domains/DNSDetail.vue:61
+#: src/components/admin/domains/DNSDetail.vue:68
 msgid "autoconfig record (Mozilla): %{ value }"
 msgstr "autoconfig レコード ( Mozilla ) : %{ value }"
 
-#: src/components/admin/domains/DNSDetail.vue:67
+#: src/components/admin/domains/DNSDetail.vue:74
 msgid "autoconfig record (Mozilla) not found"
 msgstr "autoconfig レコード ( Mozilla ) が見つかりません"
 
-#: src/components/admin/domains/DNSDetail.vue:73
+#: src/components/admin/domains/DNSDetail.vue:80
 msgid "autodiscover record (Microsoft): %{ value }"
 msgstr "autodiscover record ( Microsoft ) : %{ value }"
 
-#: src/components/admin/domains/DNSDetail.vue:79
+#: src/components/admin/domains/DNSDetail.vue:86
 msgid "autodiscover record (Microsoft) not found"
 msgstr "autodiscover record ( Microsoft ) が見つかりません"
 
-#: src/components/admin/domains/DNSDetail.vue:83
+#: src/components/admin/domains/DNSDetail.vue:90
 msgid "Authentication"
 msgstr "認証"
 
-#: src/components/admin/domains/DNSDetail.vue:87
+#: src/components/admin/domains/DNSDetail.vue:94
 msgid "SPF record found"
 msgstr "SPF レコードが見つかりました"
 
-#: src/components/admin/domains/DNSDetail.vue:90
+#: src/components/admin/domains/DNSDetail.vue:97
 msgid "SPF record not found"
 msgstr "SPF レコードが見つかりません"
 
-#: src/components/admin/domains/DNSDetail.vue:95
+#: src/components/admin/domains/DNSDetail.vue:102
 msgid "DKIM record found"
 msgstr "DKIM レコードが見つかりました"
 
-#: src/components/admin/domains/DNSDetail.vue:98
+#: src/components/admin/domains/DNSDetail.vue:105
 msgid "DKIM record not found"
 msgstr "DKIM レコードが見つかりません"
 
-#: src/components/admin/domains/DNSDetail.vue:103
+#: src/components/admin/domains/DNSDetail.vue:110
 msgid "DMARC record found"
 msgstr "DMARC レコードが見つかりました"
 
-#: src/components/admin/domains/DNSDetail.vue:106
+#: src/components/admin/domains/DNSDetail.vue:113
 msgid "DMARC record not found"
 msgstr "DMARC レコードが見つかりません"
 
-#: src/components/admin/domains/DNSDetail.vue:114
+#: src/components/admin/domains/DNSDetail.vue:121
 msgid "DKIM key"
 msgstr "DKIM キー"
 
-#: src/components/admin/domains/DNSDetail.vue:119
+#: src/components/admin/domains/DNSDetail.vue:126
 msgid "Show key"
 msgstr "キーを表示"
 
-#: src/components/admin/domains/DNSDetail.vue:125
+#: src/components/admin/domains/DNSDetail.vue:132
 msgid "Copy key to clipboard"
 msgstr "クリックしてキーをコピー"
 
-#: src/components/admin/domains/DNSDetail.vue:130
+#: src/components/admin/domains/DNSDetail.vue:137
 msgid "Generate a new DKIM key"
 msgstr "新しい DKIM キーを生成"
 
-#: src/components/admin/domains/DNSDetail.vue:137
+#: src/components/admin/domains/DNSDetail.vue:144
 msgid "Not generated"
 msgstr "生成しませんでした"
 
-#: src/components/admin/domains/DNSDetail.vue:189
+#: src/components/admin/domains/DNSDetail.vue:196
 #: src/components/admin/identities/AccountSenderAddresses.vue:73
 #: src/components/admin/identities/AliasCreationForm.vue:60
 #: src/components/admin/identities/AliasEditForm.vue:16
@@ -871,34 +874,33 @@ msgstr "生成しませんでした"
 #: src/components/admin/imap_migration/ProviderCreationForm.vue:54
 #: src/components/admin/imap_migration/ProvidersList.vue:115
 #: src/components/contacts/ContactForm.vue:85
-#: src/components/contacts/EmailField.vue:5
 msgid "Address"
 msgstr "アドレス"
 
-#: src/components/admin/domains/DNSDetail.vue:190
+#: src/components/admin/domains/DNSDetail.vue:197
 msgid "Updated"
 msgstr "更新しました"
 
-#: src/components/admin/domains/DNSDetail.vue:203
+#: src/components/admin/domains/DNSDetail.vue:210
 msgid "DKIM key copied to clipboard"
 msgstr "DKIM キーをクリップボードにコピーしました"
 
-#: src/components/admin/domains/DNSDetail.vue:216
+#: src/components/admin/domains/DNSDetail.vue:223
 msgid ""
 "A new key will be generated soon. Refresh the page in a moment to see it."
 msgstr "新しいキーをすぐに生成します。ページを再読み込みすると確認できます。"
 
-#: src/components/admin/domains/DNSDetail.vue:238
+#: src/components/admin/domains/DNSDetail.vue:245
 msgid "warning"
 msgstr "警告"
 
-#: src/components/admin/domains/DNSDetail.vue:239
+#: src/components/admin/domains/DNSDetail.vue:246
 msgid ""
 "DKIM key does not seem to be generated yet or has failed. Do you want to "
 "requeue the job?"
 msgstr "DKIM キーはまだ生成されていないか、生成に失敗しました。再生成しますか？"
 
-#: src/components/admin/domains/DNSDetail.vue:259
+#: src/components/admin/domains/DNSDetail.vue:266
 msgid ""
 "DKIM keys already exist for this domain. Do you want to overwrite them?"
 msgstr "このドメインの DKIM キーはすでに存在します。上書きしてよろしいですか？"
@@ -1738,6 +1740,7 @@ msgstr ""
 "すべての権限をもつユーザーで、あらゆる操作が可能です。デフォルトでは、そうしたユーザーはメールボックスをもっておらず、エンドユーザー向け機能を利用できません。"
 
 #: src/components/admin/identities/form_steps/AliasGeneralForm.vue:10
+#: src/components/contacts/EmailField.vue:5
 msgid "Email address"
 msgstr "メールアドレス"
 
@@ -1936,8 +1939,8 @@ msgstr "キュー ID"
 #: src/components/quarantine/QuarantineList.vue:52
 #: src/components/quarantine/QuarantineList.vue:233
 #: src/components/tools/TimeSerieChart.vue:20
-#: src/components/webmail/ComposeEmailForm.vue:65
-#: src/views/webmail/EmailView.vue:103
+#: src/components/webmail/ComposeEmailForm.vue:73
+#: src/views/webmail/EmailView.vue:112
 msgid "To"
 msgstr "宛先"
 
@@ -2408,31 +2411,35 @@ msgstr "添付"
 msgid "Schedule sending"
 msgstr "予定送信"
 
-#: src/components/webmail/ComposeEmailForm.vue:73
-#: src/components/webmail/ComposeEmailForm.vue:118
-#: src/components/webmail/ComposeEmailForm.vue:145
+#: src/components/webmail/ComposeEmailForm.vue:47
+msgid "Save as draft"
+msgstr "「下書き」に保存"
+
+#: src/components/webmail/ComposeEmailForm.vue:81
+#: src/components/webmail/ComposeEmailForm.vue:126
+#: src/components/webmail/ComposeEmailForm.vue:153
 msgid "Provide one or more addresses"
 msgstr "1 つまたは複数のアドレスを入力してください"
 
-#: src/components/webmail/ComposeEmailForm.vue:86
-#: src/components/webmail/ComposeEmailForm.vue:104
+#: src/components/webmail/ComposeEmailForm.vue:94
+#: src/components/webmail/ComposeEmailForm.vue:112
 msgid "Cc"
 msgstr "CC"
 
-#: src/components/webmail/ComposeEmailForm.vue:94
-#: src/components/webmail/ComposeEmailForm.vue:131
+#: src/components/webmail/ComposeEmailForm.vue:102
+#: src/components/webmail/ComposeEmailForm.vue:139
 msgid "Bcc"
 msgstr "BCC"
 
-#: src/components/webmail/ComposeEmailForm.vue:300
+#: src/components/webmail/ComposeEmailForm.vue:318
 msgid "Email scheduled"
 msgstr "メール送信を予定しました"
 
-#: src/components/webmail/ComposeEmailForm.vue:301
+#: src/components/webmail/ComposeEmailForm.vue:319
 msgid "Email sent"
 msgstr "メールを送信しました"
 
-#: src/components/webmail/ComposeEmailForm.vue:354
+#: src/components/webmail/ComposeEmailForm.vue:393
 msgid "You must provide one recipient at least"
 msgstr "受信者を指定してください"
 
@@ -3016,7 +3023,7 @@ msgid "Hide full headers"
 msgstr "すべてのヘッダーを隠す"
 
 #: src/views/quarantine/MessageView.vue:201
-#: src/views/webmail/EmailView.vue:267
+#: src/views/webmail/EmailView.vue:276
 msgid "Message deleted"
 msgstr "メッセージを削除しました"
 
@@ -3036,31 +3043,31 @@ msgstr "返信"
 msgid "Reply all"
 msgstr "全員に返信"
 
-#: src/views/webmail/EmailView.vue:63
+#: src/views/webmail/EmailView.vue:72
 msgid "Enable links"
 msgstr "リンクを有効に"
 
-#: src/views/webmail/EmailView.vue:68
+#: src/views/webmail/EmailView.vue:77
 msgid "Disable links"
 msgstr "リンクを無効に"
 
-#: src/views/webmail/EmailView.vue:72
+#: src/views/webmail/EmailView.vue:81
 msgid "Display source"
 msgstr "ソースを表示"
 
-#: src/views/webmail/EmailView.vue:145
+#: src/views/webmail/EmailView.vue:154
 msgid "Message scheduled at:"
 msgstr "メール送信予定 : "
 
-#: src/views/webmail/EmailView.vue:151
+#: src/views/webmail/EmailView.vue:160
 msgid "Message source"
 msgstr "メッセージのソース"
 
-#: src/views/webmail/EmailView.vue:281
+#: src/views/webmail/EmailView.vue:290
 msgid "Message marked as junk"
 msgstr "メッセージを SPAM とマークしました"
 
-#: src/views/webmail/EmailView.vue:295
+#: src/views/webmail/EmailView.vue:304
 msgid "Message marked as not junk"
 msgstr "メッセージを HAM とマークしました"