Event ID - 221

Event Id221
DescriptionAn Import Reply (full export) will be done to <Remote Dirsync Requestor Name> on the next reply.
Event InformationAccording to Microsoft:
The above errors can occur when there are corrupted messages located on the DXA queue in the Message Transfer Agent (MTA).
To remove corrupted DXA messages from the Exchange MTA, follow the steps outlined in the Microsoft Knowledge Base article, 164506 (http://support.microsoft.com/kb/164506/EN-US/), "XFOR: How to Remove a Corrupted DXA Message from Exchange MTA."
Reference LinksXFOR: Microsoft Exchange DX Returns Event ID 220 or 221

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