diff --git a/src/domains.js b/src/domains.js
index 6dbf5aa1f..f047373b1 100644
--- a/src/domains.js
+++ b/src/domains.js
@@ -307,6 +307,7 @@ function del(domain, auditSource, callback) {
     if (domain === settings.adminDomain()) return callback(new BoxError(BoxError.CONFLICT, 'Cannot remove admin domain'));
 
     domaindb.del(domain, function (error) {
+        if (error && error.reason === BoxError.CONFLICT) return callback(new BoxError(BoxError.CONFLICT, 'Could not remove domain. Check if this domain is in use by a mailbox or an app.'));
         if (error) return callback(error);
 
         eventlog.add(eventlog.ACTION_DOMAIN_REMOVE, auditSource, { domain });