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I've created an SMTP service application that archives emails by some criteria. Now I need to make postfix send a copy to my service when it receives some mail.

Most obvious way to go would be to use "content_filter = my_service". Problem is, using content_filter I will need to re-send the mail back to postfix from my service, and I don't want to do that. Is there a way to make postfix clone, not redirect, the messages to my SMTP service?

Thanks in advance.

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Look into always_bcc, recipient_bcc_maps and sender_bcc_maps, either in man 5 postconf or in the official documentation. Easiest way is probably to send a copy to an address within mydestination, and using an entry in /etc/aliases (or wherever your alias_maps points to), forward those to a script which feeds them into your archiving application.

Edit: If you need an SMTP stream, set always_bcc to something like "archive@archive.local". Then add a custom transport table in main.cf:

transport_maps = hash:/etc/postfix/transport

and edit /etc/postfix/transport to include a line like:

archive.local smtp:[127.0.0.1]:5555

After executing postmap /etc/postfix/transport, you should get the raw SMTP data stream on port 5555 on you loopback interface.

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Well, I am using the separate service application because performance is what I need here the most. And postfix documentation states that forwarding to scripts makes system work 4 times slower because it has to convert everything to non-native syntax. That's why I want to make it send the SMTP stream directly to my service application. – Max Sep 30 '09 at 14:46
And yes, I forgot to mention, there seems to be no way to forward the mail with any of those commands to the service directly. – Max Sep 30 '09 at 14:47
Have all mails bcc'd to, e.g., archive@archive.local. Create a transport_maps entry like "archive.local smtp:[127.0.0.1]:5555". Don't forget to read the documentation about transport tables. – cite Sep 30 '09 at 16:50
Thanks. That's exactly what I was looking for. – Max Oct 1 '09 at 9:54
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