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Error message "Exchange aborted receiving the message after 2xxxx bytes." - what to do?

If you see the error message Mail transfer to Exchange failed, reason: Exchange aborted receiving the message after ***** bytes. This is probably due to a message size limit in the virtual SMTP server but you are sure it is not the message size limit in the Exchange server receive connector then it probably is the Exchange 2007 antispam feature.

You need to add your server's IP address to the IP allow list in the Exchange Management Console, Server Configuration, Antispam to solve the problem.