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Duplicate e-mails QMail Microsoft POP3 Connector

eugenevdm

Regular Pleskian
None of my clients get duplicate e-mails, except a new client that is using Microsoft Small Business Server Exchange POP3 Connector.

I should add they have a catchall mailbox on the QMail side.

This only happens when they CC somebody. Please could I have some clarity on this. All I could find on Microsoft's site is this http://support.microsoft.com/kb/264249/en-us
explaining that the ISP (us!) should tell their e-mail server not to "break out" the messages in multiple copies. Is Qmail compatible with Microsoft Exchange POP3 Connector? How do I fix the problem? How do I even start?
 
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