Hi Andrea,
On 2020-03-17 20:57, Andrea Venturoli wrote:
From time to time, I receive some message that are refused and bounce.
Do to possible blacklisting, I *really* want to avoid bounces.
Here's a sample log:
sm-mta[97841]: 00DI1r4x097841: from=<in...@xxxxxxxxxxxxxxxx>, size=37059,
class=0, nrcpts=1,
msgid=<PATT3L844_19452433_q5ZeSIsrRLtOGReCXrQXgg==.8A...@xxxxxxxxxxxxxxxxxxxxxxxx>,
proto=UTF8SMTPS, daemon=MTA, relay=xxxxxxxxxxx.xxxxxxxx.net
[37.148.183.222]
sm-mta[97960]: AUTH=client, relay=localhost, mech=, bits=0
sm-mta[97960]: 00DI1r4x097841: to=xxxxxxxxxx, delay=00:00:11,
xdelay=00:00:00, mailer=cyrusv2, pri=67551, relay=localhost, dsn=5.6.7,
stat=Data format error
sm-mta[97960]: 00DI1r4x097841: 00DI264w097960: DSN: Data format error
sm-mta[97960]: 00DI264w097960: to=<in...@xxxxxxxxxxxxxxxx>,
delay=00:00:04, xdelay=00:00:04, mailer=esmtp, pri=30000,
relay=mx1.slgnt.eu., dsn=5.1.2, stat=Host unknown (Name server:
xxx.xxxxx.xx.: no data known)
I don't use sendmail but I do use the same version of Cyrus that you do.
The status 5.6.7 seems to be related to encodings. It's defined in RFC
6531, SMTP Extension for Internationalized Email:
When the SMTPUTF8-aware SMTP
server supports enhanced mail system status codes [RFC3463], reply-
code "X.6.7" [RFC5248] (see Section 4) is used, meaning "Non-ASCII
addresses not permitted for that sender/recipient".
[source: https://tools.ietf.org/html/rfc6531#section-3.5]
Do all of the failures have proto=UTF8SMTP(S) in them, or just this example?
For posterity, here is your post on the sendmail group, which I have
read: https://groups.google.com/forum/#!topic/comp.mail.sendmail/5F2UZgAYrnI
I agree with them that your anonymization of the log with xxx may have
masked important information. There may be temporary DNS failures going
on but it's impossible to tell.
--
Deborah Pickett
System Administrator
Polyfoam Australia Pty Ltd
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