From: Alain Spineux (aspineuxgmail.com)
Date: Fri Jul 06 2007 - 19:42:33 CDT

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The last part of
http://www.postfix.org/SMTPD_PROXY_README.html
is about "How Postfix talks to the before-queue content filter"

Do these rules apply to the AFTER queue filter too ?

Thanks

Alain

Here are the rules :

 The before-filter Postfix SMTP server connects to the content filter,
delivers one message, and disconnects. While sending mail into the
content filter, Postfix speaks ESMTP but uses no command pipelining.
Postfix generates its own EHLO, XFORWARD (for logging the remote
client IP address instead of localhost[127.0.0.1]), DATA and QUIT
commands, and forwards unmodified copies of all the MAIL FROM and RCPT
TO commands that the before-filter Postfix SMTP server didn't reject
itself. Postfix sends no other SMTP commands.

The content filter should accept the same MAIL FROM and RCPT TO
command syntax as the before-filter Postfix SMTP server, and should
forward the commands without modification to the after-filter SMTP
server. If the content filter or after-filter SMTP server does not
support all the ESMTP features that the before-filter Postfix SMTP
server supports, then the missing features must be turned off in the
before-filter Postfix SMTP server with the smtpd_discard_ehlo_keywords
parameter.

When the filter rejects content, it should send a negative SMTP
response back to the before-filter Postfix SMTP server, and it should
abort the connection with the after-filter Postfix SMTP server without
completing the SMTP conversation with the after-filter Postfix SMTP
server.

--
--
Alain Spineux
aspineux gmail com
May the sources be with you

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