Re: problem with Return-Path: <>

Hi Marc,

On Mon, Feb 09, 2004 at 03:23:28PM +0100, Marc Herbert wrote:
> 
> 1) It seems a few mailer-daemons set: Return-Path: <>

The Return-Path field represents what was passed as the "From" envelope.
This is the address that MTAs use to send bounces. So, you should see it in
any "MAILER-DAEMON" messages, as the MTA clearly does not care about bounces
to bounces.

> 2) it seems a few sendmails refuse such return-paths
> 
> ASK may try to transfer from (1) to (2), and then fail on a broken
> pipe like this:

?!? It's not up to sendmail to refuse such messages. If it does, then
you won't see legitimate bounces to your messages. 

I'm confused...

> Traceback (most recent call last):
>   File "/usr/bin/ask.py", line 71, in ?
>     rc = ask.filter(sys.stdin)
>   File "/usr/lib/ask/askmain.py", line 150, in filter
>     self.msg.deliver_mail("Message from Mailer-Daemon")
>   File "/usr/lib/ask/askmessage.py", line 474, in deliver_mail
>     self.mail.deliver_mail(self.config.rc_mymailbox, self.tmpfile,
> custom_header)
>   File "/usr/lib/ask/askmail.py", line 170, in deliver_mail
>     fh_mbox.write(buf)
> IOError: [Errno 32] Broken pipe
> 
> 
> I wrote the small patch attached as a workaround. Any comments
> welcome!

I'll check your patch.

Regards,
Paga

> 
> 
> 
> -- 
> "Je n'ai fait cette lettre-ci plus longue que parce que je n'ai pas eu
> le loisir de la faire plus courte." -- Blaise Pascal
> --- askmail.py	2004/02/09 13:46:34	1.1
> +++ askmail.py	2004/02/09 13:57:11
> @@ -156,8 +156,14 @@
>  		
>  		in_headers = 1;
>  
> +		returnpat = re.compile("^return-path:.*<>")
> +
>  		while 1:
>  			buf = fh_mailfile.readline();
> +			
> +			## nullmailer does not want an empty return-path
> +			if (in_headers and returnpat.match(buf.lower())):
> +				buf = "Return-Path: <" + self.config.rc_mymails[0] + ">\n"
>  
>  			if (buf == ''):
>  				break


-- 
Marco Paganini          | UNIX / Linux / Networking
[email protected]   | PGP: http://www.paganini.net/pgp/
http://www.paganini.net | Magnus Frater te spectat...


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