[gentoo-server] Disclaimer to forwarded mails to external domain?

[Vinícius Ferrão]

Hello dudes,

I'm considering to implement a new feature in my Postfix Mail Filtering Gateway.

It would be great to add a disclaimer note to forwarded mails to an external domain. Since I'm already running amavisd-new, with all his friends, I was thinking to invite alterMIME to the party.

The tricky part is how to detected which messages are automatically forwarded to an external domain.

A quick example:

Our domain is mydomain.com and all mails received by john@××××××××.com are automatically redirected (forwarded) to john@××××××××××××××.com. And when this behaviour is detected the disclaimer must be added to the received message message.

So the main question is: how to do this? And just in case: alterMIME is the best solution?

Thanks in advance,
Vinícius Ferrão