Mail.log full of "no SASL support" messages

Maintenance
1

There are a lot of these warnings in mail.log. Can anyone tell me what exactly causes them and how to fix it? When looking at the Google results, I thinks it’s a more complicated problem. Here’s some complete example, maybe it helps:

Jun 24 08:06:57 box postfix/smtpd[26814]: connect from mout.gmx.net[212.227.15.19]
Jun 24 08:06:57 box postfix/smtpd[26814]: warning: restriction `reject_authenticated_sender_login_mismatch' ignored: no SASL support
Jun 24 08:06:57 box postgrey[642]: action=pass, reason=triplet found, client_name=mout.gmx.net, client_address=212.227.15.19/32, sender=someone@gmx.de, recipient=me@box.miab
Jun 24 08:06:57 box postfix/smtpd[26814]: 89FEA64007A: client=mout.gmx.net[212.227.15.19]
Jun 24 08:06:57 box postfix/cleanup[26817]: 89FEA64007A: message-id=<INX.someid.bounce12@inx1and1.de>
Jun 24 08:06:57 box opendkim[23131]: 89FEA64007A: s=isystem1 d=fmp.gmxnet.de SSL
Jun 24 08:06:57 box opendmarc[572]: implicit authentication service: me@box.miab
Jun 24 08:06:57 box opendmarc[572]: 89FEA64007A ignoring Authentication-Results at 20 from mqgmx024.server.lan
Jun 24 08:06:57 box opendmarc[572]: 89FEA64007A: fmp.gmxnet.de none
Jun 24 08:06:57 box postfix/qmgr[32617]: 89FEA64007A: from=<someone@gmx.de>, size=34214, nrcpt=1 (queue active)
Jun 24 08:06:57 box postfix/smtpd[26814]: disconnect from mout.gmx.net[212.227.15.19] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
Jun 24 08:06:57 box spampd[21716]: processing message <INX.someid.bounce12@inx1and1.de> for <me@box.miab>
Jun 24 08:07:00 box spampd[21716]: clean message <INX.someid.bounce12@inx1and1.de> (0.01/5.00) from <someone@gmx.de> for <me@box.miab> in 2.80s, 34438 bytes.
Jun 24 08:07:00 box postfix/lmtp[26818]: 89FEA64007A: to=<me@box.miab>, relay=127.0.0.1[127.0.0.1]:10025, delay=3.3, delays=0.41/0/0.01/2.9, dsn=2.0.0, status=sent (250 2.0.0 <me@box.miab> oDATMIFoEF3DaAAAr2IX0w Saved)
Jun 24 08:07:00 box postfix/qmgr[32617]: 89FEA64007A: removed

In this case it was a reputable, huge mailprovider. But the warning happens with all kind of other senders, too.

PS: Sorry about the title, wouldn’t let me use a better one.

2

every time after a MIAB update like today on v0.53a we have to adjust the main.cf Postfix file.

#smtpd_sasl_auth_enable=yes
smtpd_sasl_auth_enable=no

otherwise we also have the warning in the Postfix log file:

May 9 13:21:26 box postfix/smtpd[12900]: warning: restriction `reject_authenticated_sender_login_mismatch’ ignored: no SASL support

3

This is the expected behavior for unsupported modifications.

Do you care to elaborate on how this unsupported modification will change the behavior of MiaB?

4

I can not see any change in the handling of MiaB, with or without this adjustment in the configuration, for me personally it is only cosmetic. MiaB is the best mail solution I have learned so far. Thanks a lot