dovecot - Apr 2007 - Deliver sending bounces from 'MAILER-DAEMON@'

Hello,

I'm having a problem with postfix and/or dovecots "deliver".
I'm
getting these lines in the mail log:


| Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E: from=<>,
size=3055, nrcpt=1 (queue active)
| Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E:
to=<MAILER-DAEMON@>, relay=none, delay=0.01, delays=0.01/0.01/0/0,
dsn=5.1.3, status=bounced (bad address syntax)

After some debugging, it seems that those lines in the log appear if
I send mail to an account which is over quota. (I'm using the
Maildir++ quota)

This is from my dovecot.conf:

| protocol lda {
|   postmaster_address = MAILER-DAEMON at my.domain.tld
|   mail_plugins = quota
|   auth_socket_path = /var/run/dovecot/auth-master
|   hostname = my.mail.server
|   sendmail_path = /usr/sbin/sendmail
| }

It seems to me that dovecot is sending bounce messages from
'MAILER-DAEMON@' ..

Does anyone know why this is happening, or how I can specify the
address to be used? I'm using dovecot 1.0.0.

-- 
Erland Nylend

On Tue, 2007-04-24 at 12:49 +0200, Erland Nylend wrote:
> | Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E: from=<>,
size=3055, nrcpt=1 (queue active)
> | Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E:
to=<MAILER-DAEMON@>, relay=none, delay=0.01, delays=0.01/0.01/0/0,
dsn=5.1.3, status=bounced (bad address syntax)
..
> It seems to me that dovecot is sending bounce messages from
> 'MAILER-DAEMON@' ..
It says to=<MAILER-DAEMON@> so I'd guess the Return-Path: header in
the
message was that?

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Hello Timo,

On 2007-05-11, 16:18, Timo Sirainen wrote:
> > It seems to me that dovecot is sending bounce messages from
> > 'MAILER-DAEMON@' ..
> 
> It says to=<MAILER-DAEMON@> so I'd guess the Return-Path: header
in the
> message was that?
Thanks for the reply. I've managed to reproduce it. 

If I send a bounce to an account over quota ("mail from" set to
<>),
then dovecot sends a bounce on the bounce, to "MAILER-DAEMON@":

| # telnet localhost 25
| Trying 127.0.0.1...
| Connected to localhost.localdomain (127.0.0.1).
| Escape character is '^]'.
| 220 my.mail.server ESMTP Postfix
| helo foo
| 250 my.mail.server
| mail from: <>           
| 250 2.1.0 Ok
| rcpt to: mailbox_over_quota at domain.tld
| 250 2.1.5 Ok
| data
| 354 End data with <CR><LF>.<CR><LF>
| testing
| .
| 250 2.0.0 Ok: queued as A366C27675

(It seems that postfix sets the return-path header based on the "mail
from", so the mail contains "Return-Path: <>" )

This shows the mail generated by deliver:

| May 11 17:55:27 my postfix/pickup[27580]: D6DB527681: uid=3000 from=<>
| May 11 17:55:27 my postfix/cleanup[14455]: D6DB527681:
message-id=<dovecot-1178898925-234813-0 at my.mail.server>
| May 11 17:55:27 my postfix/qmgr[3360]: D6DB527681: from=<>, size=1538,
nrcpt=1 (queue active)
| May 11 17:55:27 my postfix/qmgr[3360]: D6DB527681: to=<MAILER-DAEMON@>,
relay=none, delay=0.01, delays=0.01/0/0/0, dsn=5.1.3, status=bounced (bad
address syntax)
| May 11 17:55:27 my postfix/qmgr[3360]: D6DB527681: removed

This must be an error, then .. Dovecots deliver should not send
bounces in response to bounce mail. Could you have a look at it?

-- 
Erland Nylend

Hello Timo,

On 2007-05-11, 16:18, Timo Sirainen wrote:
> On Tue, 2007-04-24 at 12:49 +0200, Erland Nylend wrote:
> > | Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E: from=<>,
size=3055, nrcpt=1 (queue active)
> > | Apr 24 11:42:08 smtp2 postfix/qmgr[6176]: 05BAE3B67E:
to=<MAILER-DAEMON@>, relay=none, delay=0.01, delays=0.01/0.01/0/0,
dsn=5.1.3, status=bounced (bad address syntax)
> ..
> > It seems to me that dovecot is sending bounce messages from
> > 'MAILER-DAEMON@' ..
> 
> It says to=<MAILER-DAEMON@> so I'd guess the Return-Path: header
in the
> message was that?
Could you have a look at this case again?

The messages to deliver have the smtp "mail from" and Return-Path
set to <>. (they're bounces) 

I can reproduce the problem by telnet'ing to the postfix server, and
sending bounce mails to an account over quota.

It seems that deliver is sending bounces on the bounces, which I
think is an error.


-- 
Erland Nylend