Outlook 2010 will not forward attachment

We have a User that "suddenly" cannot forward any attachments if they originated outside the Windows Domain. We have disabled his AVAST Antivirus Mail Shield, upgraded from Outlook 2007 to Outlook 2010, but with the same results. There are no errors in the Event Log. The error the User gets is "Cannot send this item." Once he closes the error dialog, it drops into his Drafts folder. The temporary Internet Files location for Outlook has been cleared, but he receives the same error.
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Brad GrouxSenior Manager (Wintel Engineering)Commented:
You need to do some troubleshooting on the Exchange server(s). Have they made any changes to the Anti-Virus solutions on the Exchange servers? You might want to verify the service account being used for the AV service. If you're utilizing Symantec, verify everything is working for SMSME.

The fact that it is external users only points to an AV solution that utilizes AD authentication.

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TPAMisfitAuthor Commented:
Not external Users, but an attachment that came from outside. Only change on the Exchange Server has been Rollup 6 for Exchange 2010 SP3. Odd...
TPAMisfitAuthor Commented:
BTW - this works fine using Outlook web access, so we're thinking it is isolated to the mail client - Outlook 2010.
TPAMisfitAuthor Commented:
Something, and the only thing we can think of is the AVAST A/V on the Client workstation, somehow recognizes internal attachments and external attachments and then refuses to send them if the originated from outside. We may need to try removing AVAST and testing. Just stopping the service does not work and it does not allow us to disable the service.
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