diff --git a/src/domains.js b/src/domains.js
index 38abfa073..2b984989a 100644
--- a/src/domains.js
+++ b/src/domains.js
@@ -287,6 +287,7 @@ async function del(domain, auditSource) {
 
     const [error, results] = await safe(database.transaction(queries));
     if (error && error.code === 'ER_ROW_IS_REFERENCED_2') {
+        if (error.message.includes('mailboxes_aliasDomain_constraint')) throw new BoxError(BoxError.CONFLICT, 'Domain is in use in a mailbox, list or an alias');
         if (error.message.includes('mailboxes_domain_constraint')) throw new BoxError(BoxError.CONFLICT, 'Domain is in use in a mailbox, list or an alias');
         if (error.message.includes('apps_mailDomain_constraint')) throw new BoxError(BoxError.CONFLICT, 'Domain is in use in an app\'s mailbox section');
         if (error.message.includes('locations')) throw new BoxError(BoxError.CONFLICT, 'Domain is in use in an app\'s location');