diff --git a/dashboard/src/views/EmailMailboxesView.vue b/dashboard/src/views/EmailMailboxesView.vue
index 6a3213658..036fcf290 100644
--- a/dashboard/src/views/EmailMailboxesView.vue
+++ b/dashboard/src/views/EmailMailboxesView.vue
@@ -185,7 +185,7 @@ async function refreshDomain(domain) {
     m.owner = users.value.find(u => u.id === m.ownerId) || null;
     if (!m.owner) m.owner = groups.value.find(g => g.id === m.ownerId) || null;
 
-    m.ownerDisplayName = m.owner ? (m.owner.username || m.owner.name) : '';
+    m.ownerDisplayName = m.owner ? (m.owner.username || m.owner.name || m.owner.email) : '';
     cachedMailboxUsage.value[m.fullName] = cachedMailboxUsage.value[m.fullName] || {};
 
     // update in-place or add