diff --git a/modoboa/admin/tests/test_mx.py b/modoboa/admin/tests/test_mx.py
index 7d39dec24..1823be334 100644
--- a/modoboa/admin/tests/test_mx.py
+++ b/modoboa/admin/tests/test_mx.py
@@ -129,6 +129,7 @@ class MXTestCase(ModoTestCase):
             get_domain_mx_list("no-ns-servers.example.com")
             get_domain_mx_list("timeout.example.com")
             get_domain_mx_list("no-lookup.example.com")
+            get_domain_mx_list("no-answer.example.Com")
             get_domain_mx_list("bad-response.example.com")
         log.check(
             ("modoboa.admin", "ERROR",
diff --git a/modoboa/admin/tests/utils.py b/modoboa/admin/tests/utils.py
index 2c6cee995..6a586a3c1 100644
--- a/modoboa/admin/tests/utils.py
+++ b/modoboa/admin/tests/utils.py
@@ -45,12 +45,14 @@ _POSSIBLE_DNS_RESULTS = {
     "no-ns-servers.example.com": NoNameservers(),
     "bad-response.example.com": [_BAD_MX_RECORD],
     "no-lookup.example.com": [_DNE_MX_RECORD],
+    "no-answer.example.com": [_DNE_MX_RECORD],
 }
 
 _POSSIBLE_DNS_RESULTS_NO_MX = {
     "does-not-exist.example.com": NXDOMAIN(),
     "mx2.example.com": NXDOMAIN(),
     "no-lookup.example.com": NXDOMAIN(),
+    "no-answer.example.com": NoAnswer(),
     "bad-response.example.com": [RRsetInvalid()],
 }
 _POSSIBLE_IP_RESULTS = {