Event ID - 221

Event Id221
SourceMSExchangeDX
DescriptionAn Import Reply (full export) will be done to <Remote Dirsync Requestor Name> on the next reply.
Event InformationAccording to Microsoft:
CAUSE:
The above errors can occur when there are corrupted messages located on the DXA queue in the Message Transfer Agent (MTA).
RESOLUTION:
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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