| Event Id | 521 |
| Source | SMTPSVC |
| Description | Cannot move message file %1 in the drop directory. Message operation will be retried. |
| Event Information | Check for available disk space on the hard drive that holds the Drop directory. |
| Reference Links |
Catch threats immediately
We work side-by-side with you to rapidly detect cyberthreats
and thwart attacks before they cause damage.