diff --git a/src/backend/mailbox_manager/tests/test_utils_dimail_client.py b/src/backend/mailbox_manager/tests/test_utils_dimail_client.py
index fb7ece60f..a76e4b2c4 100644
--- a/src/backend/mailbox_manager/tests/test_utils_dimail_client.py
+++ b/src/backend/mailbox_manager/tests/test_utils_dimail_client.py
@@ -3,6 +3,8 @@
 """
 
 import re
+from logging import Logger
+from unittest import mock
 
 import pytest
 import responses
@@ -61,7 +63,8 @@ def test_dimail_synchronization__already_sync():
     assert set(models.Mailbox.objects.filter(domain=domain)) == set(pre_sync_mailboxes)
 
 
-def test_dimail_synchronization__synchronize_mailboxes():
+@mock.patch.object(Logger, "warning")
+def test_dimail_synchronization__synchronize_mailboxes(mock_warning):
     """A mailbox existing solely on dimail should be synchronized
     upon calling sync function on its domain"""
     domain = factories.MailDomainEnabledFactory()
@@ -77,33 +80,50 @@ def test_dimail_synchronization__synchronize_mailboxes():
             status=status.HTTP_200_OK,
             content_type="application/json",
         )
+
+        mailbox = {
+            "type": "mailbox",
+            "status": "broken",
+            "email": f"oxadmin@{domain.name}",
+            "givenName": "Admin",
+            "surName": "Context",
+            "displayName": "Context Admin",
+        }
+        mailbox_with_wrong_domain = {
+            "type": "mailbox",
+            "status": "broken",
+            "email": f"johndoe@wrongdomain.com",
+            "givenName": "John",
+            "surName": "Doe",
+            "displayName": "John Doe",
+        }
+        mailbox_with_wrong_local_part = (
+            {
+                "type": "mailbox",
+                "status": "broken",
+                "email": f"nawaké@{domain.name}",
+                "givenName": "Joe",
+                "surName": "Doe",
+                "displayName": "Joe Doe",
+            },
+        )
+
         rsps.add(
             rsps.GET,
             re.compile(rf".*/domains/{domain.name}/mailboxes/"),
             body=str(
-                [
-                    {
-                        "type": "mailbox",
-                        "status": "broken",
-                        "email": f"oxadmin@{domain.name}",
-                        "givenName": "Admin",
-                        "surName": "Context",
-                        "displayName": "Context Admin",
-                    },
-                    {
-                        "type": "mailbox",
-                        "status": "broken",
-                        "email": f"johndoe@wrongdomain.com",
-                        "givenName": "John",
-                        "surName": "Doe",
-                        "displayName": "John Doe",
-                    },
-                ]
+                [mailbox, mailbox_with_wrong_domain, mailbox_with_wrong_local_part]
             ),
             status=status.HTTP_200_OK,
             content_type="application/json",
         )
+
         imported_mailboxes = dimail_client.synchronize_mailboxes_from_dimail(domain)
+        assert mock_warning.call_count == 1
+        assert mock_warning.call_args_list == (
+            "Import of email %s failed",
+            f"nawaké@{domain.name}",
+        )
 
     mailbox = models.Mailbox.objects.get()
     assert mailbox.local_part == "oxadmin"
diff --git a/src/backend/mailbox_manager/utils/dimail.py b/src/backend/mailbox_manager/utils/dimail.py
index 55a6c084d..363258ed4 100644
--- a/src/backend/mailbox_manager/utils/dimail.py
+++ b/src/backend/mailbox_manager/utils/dimail.py
@@ -2,6 +2,7 @@
 
 import ast
 import smtplib
+from email.headerregistry import Address
 from logging import getLogger
 
 from django.conf import settings
@@ -200,20 +201,28 @@ def synchronize_mailboxes_from_dimail(self, domain):
             if not dimail_mailbox["email"] in [
                 str(people_mailbox) for people_mailbox in people_mailboxes
             ]:
-                # sometimes dimail api returns email from another domain, so we decide to exclude
-                # this kind of email
-                dimail_local_part, dimail_domain = dimail_mailbox["email"].split("@")
-                if dimail_domain == domain.name:
-                    # creates a mailbox on our end
-                    mailbox = models.Mailbox.objects.create(
-                        first_name=dimail_mailbox["givenName"],
-                        last_name=dimail_mailbox["surName"],
-                        local_part=dimail_local_part,
-                        domain=domain,
-                        secondary_email=dimail_mailbox[
-                            "email"
-                        ],  # secondary email is mandatory. Unfortunately, dimail doesn't store any.
-                        # We temporarily give current email as secondary email.
+                try:
+                    # sometimes dimail api returns email from another domain, so we decide to exclude
+                    # this kind of email
+                    dimail_local_part, dimail_domain = dimail_mailbox["email"].split(
+                        "@"
                     )
-                    imported_mailboxes.append(str(mailbox))
+                    address = Address(
+                        dimail_mailbox["displayName"], dimail_local_part, dimail_domain
+                    )
+                    if address.domain == domain.name:
+                        # creates a mailbox on our end
+                        mailbox = models.Mailbox.objects.create(
+                            first_name=dimail_mailbox["givenName"],
+                            last_name=dimail_mailbox["surName"],
+                            local_part=address.username,
+                            domain=domain,
+                            secondary_email=dimail_mailbox[
+                                "email"
+                            ],  # secondary email is mandatory. Unfortunately, dimail doesn't store any.
+                            # We temporarily give current email as secondary email.
+                        )
+                        imported_mailboxes.append(str(mailbox))
+                except Exception as err:
+                    logger.warning("Import of email %s failed", dimail_mailbox["email"])
         return imported_mailboxes