From: Wietse Venema (wietseporcupine.org)
Date: Fri Dec 17 2010 - 16:28:27 CST

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Zhou, Yan:
> Hi there,
>
> I am using a script to process each incoming message into Postfix.
>
> In master.cf, I have something like this. The python script calls
> another Java program do the heavy-lifting message processing.
>
> connector unix - n n - - pipe
> flags= user=hubdirect argv=python /usr/local/bin/messageprocessor.py
>
> It works great. Now, as I process message, I want to generate a MDN
> message to the sender (so that he knows I got it). I added code in the
> heavy-lifting Java program to send a message back to SMTP server. I got
> an error:"you must issue STARTTLS first".

That is not a Postfix error message. You are either connecting to
the wrong mail system, or you are inaccurate in your problem
description.

> I have no idea why Postfix asks for that, because it is not configured
> to use SMTP authentication. Anyway, my question is: can this be
> supported: during processing a message, send another message back to
> Postfix. (It almost sounds like an re-entrance in programming terms).

It is a terrible mistake to reply to every email message. At the
very least be sure to follow the guidelines in RFC 3834 or
people will come after you.

    http://tools.ietf.org/html/rfc3834

And whatever you send back, NEVER NEVER NEVER USE the address in
the FROM and TO message header. Instead, use the envelope sender,
which are supplied with the pipe(8) ${sender} and ${recipient}
macros. Again, if you respond to the FROM and TO message header
address, you will send mail to the wrong place.

        Wietse

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