dovecot - Nov 2013 - status=undeliverable (lost connection with mail.larptreff.de[private/dovecot-lmtp] while sending MAIL FROM)

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Good morning dovecot-community,

I noticed a strange log-entry since the last day:

Nov  7 08:34:42 hetzner postfix/lmtp[3764]: 61CB01A3938:
to=<jg+introversion at larptreff.de>,
relay=mail.larptreff.de[private/dovecot-lmtp], delay=0.05,
delays=0.01/0.01/0.02/0.01, dsn=4.4.2, status=undeliverable (lost
connection with mail.larptreff.de[private/dovecot-lmtp] while sending
MAIL FROM)

Thankfully I've configured a cronjob for a daily pflogsumm-report, but
I don't understand this. It worked for months like a charm.

It seems this only happens on mails with "+"-Delimiter.


In my opinion there is only one thing which could cause this problem:
I updated my dovecot on 2013/11/04 from 2.2.6-1~auto+36 to 2.2.7-1~auto+2

maillog:
http://pastebin.com/WDGfEjdp

doveconf -n:
http://pastebin.com/ay6dxiUf

I will try to downgrade again, did someone have a clue? Changelog from
2.2.7 didn't show changes on lmtp.

Best regards,
Jan
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBAgAGBQJSe0cCAAoJENEKhqzzuxPlLOsH/iQLHuYXH/8HQJI1cyOQ/Xkl
KK010kT9EwOZCax+xputF1Cyg9XSCGBwMBA8YFWjTk57EVfNZ4RZLCkpZQU8b0X/
SsDq7jyh8QTBf7K2LEs34L6g2OMbuhv3Hl+D/RqBm09HPoBUGJZEM5ZQu28QE7rD
GETa3XkQPwMyo+3GwWXmAzg3wz4tOEGg6meaOzQlGVJshQpSKbDjvln5RtsVc1Qh
X9Xa4HdEesH/NXxr6uKUUEjHcp67BLWvmZHrDDIOp4dATqxDbq29QGfiJFvURKur
DJZ2hbPPgEFf/Wdf5l3PXfV2OgnubyLiTgRZ7pb+xFNUAlJ2YCeRv5CUigLaps8=0Jya
-----END PGP SIGNATURE-----

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Additional note: Downgrade impossible because

  http://xi.rename-it.nl/debian/

didn't have the 2.2.6 packages anymore. :(
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBAgAGBQJSe0hjAAoJENEKhqzzuxPljrwH/0GGwoFVPZVEfqvM0QuvRduB
qCu1MtscKaiSyaXp5m5I2kfZ0TJL1BcARMGEjeDaCULQf6Z3v197EDHCto9VL0eT
acUCC1YnbKKiTmkETvIFP2zZwmkthur6hOOmGWn02SDvpIdiPq0nKMaD8fxTnETd
r4dafw8fkTpEJXiEHk9AZv9xcTOdEbZz66gNb0gN3hNs5+uVF1wjznv1JfnFys1u
JSufXKBmmASBzPqTsMmEJ9KT+IFEDzH5GWWo0RD15RgF8Lpr883XWfmX3WjK8Tbw
Mbwfr+PinkAJ/B1DflzaIWfklNXReh298WdcUAZVL0aT9/Cg7xicHQ5RBrGhBl4=kjqG
-----END PGP SIGNATURE-----

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Thu, 7 Nov 2013, Jan Phillip Greimann wrote:
> maillog:
> http://pastebin.com/WDGfEjdp
are there some other log files, too? In it one sees that the recipient 
jg+introversion at larptreff.de is successfully interpreted as 
jg at larptreff.de and data seems to be good as well:
  maildir++: root=/var/vmail/larptreff.de/jg/Maildir, index=, indexpvt=,
control=, inbox=/var/vmail/larptreff.de/jg/Maildir

But I don't see any log entry about that a deliviery has been tried at 
all.

- -- 
Steffen Kaiser
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEVAwUBUntTkV3r2wJMiz2NAQL7aQgApEPYGOhO5QQB/8xj0QbPHg7CIH8u2j5b
GrbyXPTHjag5U+vIqooY8SkBzRzBAzN5RhWg0Ss3gy9dkxzukZWjb3jfF7nMrvGa
AQ9q30nex0Lq/WTmzsEvsnSctwBCtggM2IQZbsz1uKBM1L2KaOY5Gp9CUsPqhN8A
QHkxvHVllX6gxOFw6/RoFYnFrrbUHZ1dNA+iSkQfA44oiCC/fGQGOExsoq1ODZ2w
Bahm31Ul5Yls1SquwHQEXraGhXxczPkBl7LPXwNiPM0p/t9ad/ItfonEQxBVGfS3
wMHMhH+iJaE8Qyc5G2Am6Z6mytWcidwAUj+BO/CYpgt5Hk2adpaJ2w==Qaog
-----END PGP SIGNATURE-----

On 2013-11-07 8:53, Jan Phillip Greimann wrote:

This is dovecot 2.2.7, postfix 2.10.2, all addresses type virtual 
mailbox domain class, and dovecot/lmtp delivery.
> I noticed a strange log-entry since the last day:
> 
> Nov  7 08:34:42 hetzner postfix/lmtp[3764]: 61CB01A3938:
> to=<jg+introversion at larptreff.de>,
> relay=mail.larptreff.de[private/dovecot-lmtp], delay=0.05,
> delays=0.01/0.01/0.02/0.01, dsn=4.4.2, status=undeliverable (lost
> connection with mail.larptreff.de[private/dovecot-lmtp] while sending
> MAIL FROM)
I noticed as well, that some of my addresses lead to unusual rejections 
never anticipated before:

postfix/lmtp[1234]: 3dFbVw2NVmz6SL: to=<example at example.com>, 
relay=mx1.example.com[private/dovecot-lmtp], delay=0.04, 
delays=0.03/0/0/0.01, dsn=4.4.2, status=undeliverable (lost connection 
with mx1.example.com[private/dovecot-lmtp] while sending MAIL FROM)
> It seems this only happens on mails with "+"-Delimiter.
In my case regular addresses are rejected as well (see example).

What I really do not understand is that out of e.g. 50 different 
recipient addresses of one virtual mailbox domain only a few are 
rejected, the other pass as usual. This is not random, some addresses 
pass always, others fail reproducible.
> In my opinion there is only one thing which could cause this problem:
> I updated my dovecot on 2013/11/04 from 2.2.6-1~auto+36 to 
> 2.2.7-1~auto+2
I updated two days ago.
> I will try to downgrade again, did someone have a clue?
I have no clue what leads to those random rejections of recipient 
addresses. After setting ...

| warn_if_reject reject_unverified_recipient

... those mails are accepted. But I do consider this a temporary 
workaround.

Regards,
Michael