Event ID - 31500

Event Id31500
SourceMSExchangeNotes
DescriptionNotes to exchange Sender: user/cert@domain, size xxxx, Message id: C=US, a= , p=microsoft, l:messageid date time, notes:domain (servername/cert).
Event InformationAccording to Microsoft:
CAUSE:
The apostrophe character () is not allowed when checking the user name.
RESOLUTION:
To resolve this problem, obtain the latest service pack for Exchange Server 5.5.
Reference LinksXFOR: Notes Connector Rejects Incoming Messages with the Apostrophe () Character in the SMTP Address

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