diff --git a/app/models.py b/app/models.py
index c2ad0e45..bb51033a 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1528,15 +1528,6 @@ class Mailbox(db.Model, ModelMixin):
         cls.query.filter(cls.id == obj_id).delete()
         db.session.commit()
 
-    def nb_email_log(self):
-        return (
-            db.session.query(EmailLog)
-            .join(Contact, EmailLog.contact_id == Contact.id)
-            .join(Alias, Alias.id == Contact.alias_id)
-            .filter(Alias.mailbox_id == self.id)
-            .count()
-        )
-
     @property
     def aliases(self) -> [Alias]:
         ret = Alias.filter_by(mailbox_id=self.id).all()
diff --git a/cron.py b/cron.py
index 3ed12027..bb60cf77 100644
--- a/cron.py
+++ b/cron.py
@@ -6,6 +6,7 @@ import arrow
 from arrow import Arrow
 
 from app import s3
+from app.alias_utils import nb_email_log_for_mailbox
 from app.api.views.apple import verify_receipt
 from app.config import (
     IGNORED_EMAILS,
@@ -289,8 +290,10 @@ def sanity_check():
         sleep(1)
         if not email_domain_can_be_used_as_mailbox(mailbox.email):
             mailbox.nb_failed_checks += 1
-            # alert if too much fail
-            if mailbox.nb_failed_checks > 10:
+            nb_email_log = nb_email_log_for_mailbox(mailbox)
+
+            # alert if too much fail and nb_email_log > 100
+            if mailbox.nb_failed_checks > 10 and nb_email_log > 100:
                 log_func = LOG.exception
             else:
                 log_func = LOG.warning
@@ -299,7 +302,7 @@ def sanity_check():
                 "issue with mailbox %s domain. #alias %s, nb email log %s",
                 mailbox,
                 mailbox.nb_alias(),
-                mailbox.nb_email_log(),
+                nb_email_log,
             )
         else:  # reset nb check
             mailbox.nb_failed_checks = 0