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We have a group called 'everyone' that we use to distribute messages to all users. yes, I have precautions in place on our inbound spam filter to prevent abuse. One of the users had forwarding (to an address in a different domain) set up on his account. Someone sent an e-mail with alrge attachments to 'everyone'. The message was rejected by the forwarded domain for being too large.

Here's the interesting part -- before forwarding it, Kerio Connect 8.0 changed the 'From' address to 'everyone', not the address that had forwarding set. So, when the other server rejected it, it sent the rejection e-mail to 'everyone'.

Relevant debug log entries:

[08/Jan/2013 10:53:50][4644] {smtpc} Forwarding message, sender address changed from to everyone<_at_>

[08/Jan/2013 10:53:50][4644] {smtpc} Sent MAIL command

[08/Jan/2013 10:53:50][4644] {smtpc} Got reply: 250 2.1.0 Ok

[08/Jan/2013 10:53:50][4644] {smtpc} Adding ORCPT=rfc822; to recipient address yyyyyyyy<_at_>

Good is better than evil because it's nicer
--Mammy Yokum
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