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MX record for our domain points to dyndns.com, where upto 50 MB messages are received. From dyndns setup is to push mails to a zimbra (postfix) server inside the corporate firewall, where in message limit is set to 5MB.

When incoming messages are more than 5MB, we are expecting some kind of notification - it can be bounce notification, email to admin or logging of such actions. Can you help, how to setup this? Or where in postfix logs can we look for error notifications?

Thanks alot for your time, and I hope i've asked the question correctly.

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Can you increase attachment size limit in zimbra? –  Sibin Grasic Dec 25 '13 at 23:32
The reason is, we want to restrict attachment size to 5MB within in the corporate mail. So requirement is to somehow send a reject notification - if attachment size is bigger, so that sender knows attachment was not received. dyndns.com is accepting 50MB and this is not configurable :-( ! What we are looking for is, when dyndns delivers the mail to zimbra (postfix) mail server, it should reject the mail with some message. –  Premjith Jan 7 at 18:01
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