[exim-dev] [Bug 2709] SMTP Error 451

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Dla: exim-dev
Temat: [exim-dev] [Bug 2709] SMTP Error 451
https://bugs.exim.org/show_bug.cgi?id=2709

--- Comment #5 from faca5 <studiofaca@???> ---
Log error local host:
2022-08-11 07:09:44 1oM0Rz-0004DZ-SN <= *** H=(***) [***]:51620 P=esmtpsa
X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 A=dovecot_login:*** S=4602
id=00a101d8ad40$91dbc140$b59343c0$@*** T="***" for ***@gmail.com
2022-08-11 07:09:44 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc
1oM0Rz-0004DZ-SN
2022-08-11 07:09:44 1oM0Rz-0004DZ-SN Sender identification U=*** D=*** S=***
2022-08-11 07:09:44 1oM0Rz-0004DZ-SN smtp connection outbound 1660194584
1oM0Rz-0004DZ-SN *** ***@gmail.com
2022-08-11 07:09:46 smtp connection from (***) [***]:51620 closed by QUIT
2022-08-11 07:10:04 1oM0Rz-0004DZ-SN == ***@gmail.com R=dkim_lookuphost defer
(-1): host lookup did not complete


Log success local host:
2022-08-11 07:10:59 1oM0TD-0004GD-DR <= *** H=(***) [***]:51548 P=esmtpsa
X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 A=dovecot_login:*** S=4603
id=00ae01d8ad40$bee12d10$3ca38730$@*** T="***" for ***@gmail.com
2022-08-11 07:10:59 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc
1oM0TD-0004GD-DR
2022-08-11 07:10:59 1oM0TD-0004GD-DR Sender identification U=*** D=*** S=***
2022-08-11 07:10:59 1oM0TD-0004GD-DR smtp connection outbound 1660194659
1oM0TD-0004GD-DR *** ***@gmail.com
2022-08-11 07:11:02 smtp connection from (***) [***]:51548 closed by QUIT
2022-08-11 07:11:05 1oM0TD-0004GD-DR => ***@gmail.com R=dkim_lookuphost
T=dkim_remote_smtp H=g***.google.com [***]
X=TLS1.2:ECDHE-ECDSA-AES128-GCM-SHA256:128 C="250 2.0.0 OK 1660194665
j8-20020a5d4648000000b002217db8de34si9091493wrs.873 - gsmtp"
2022-08-11 07:11:06 1oM0TD-0004GD-DR Completed


Log error external SMTP host:
2022-08-11 07:12:30 cwd=/ 6 args: /usr/sbin/exim -ps -bd -q60m -oP
/var/spool/exim/exim-daemon.pid
2022-08-11 07:12:30 exim 4.95 daemon started: pid=16904, -q1h, listening for
SMTP on port 25 (IPv6 and IPv4) port 2525 (IPv6 and IPv4) port 587 (IPv6 and
IPv4) and for SMTPS on port 465 (IPv6 and IPv4)
2022-08-11 07:12:30 cwd=/var/spool/exim 2 args: /usr/sbin/exim -q
2022-08-11 07:12:30 Start queue run: pid=16908
2022-08-11 07:12:50 1oM0Rz-0004DZ-SN == ***@gmail.com R=smarthost defer (-36):
host lookup for smtp.*** did not complete (DNS timeout?)
2022-08-11 07:12:50 End queue run: pid=16908


Log success external SMTP host:
2022-08-11 07:13:03 cwd=/usr/local/cpanel/whostmgr/docroot 2 args:
/usr/sbin/exim -bpra
2022-08-11 07:13:09 cwd=/usr/local/cpanel/whostmgr/docroot 4 args:
/usr/sbin/exim -v -M 1oM0Rz-0004DZ-SN
2022-08-11 07:13:09 1oM0Rz-0004DZ-SN [***] SSL verify error: depth=0 error=self
signed certificate
cert=/C=--/ST=SomeState/L=SomeCity/O=SomeOrganization/OU=SomeOrganizationalUnit/CN=98994/emailAddress=root@98994
2022-08-11 07:13:09 1oM0Rz-0004DZ-SN [***] SSL verify error: depth=0
error=certificate has expired
cert=/C=--/ST=SomeState/L=SomeCity/O=SomeOrganization/OU=SomeOrganizationalUnit/CN=98994/emailAddress=root@98994
2022-08-11 07:13:09 1oM0Rz-0004DZ-SN [***] SSL verify error: certificate name
mismatch:
DN="/C=--/ST=SomeState/L=SomeCity/O=SomeOrganization/OU=SomeOrganizationalUnit/CN=98994/emailAddress=root@98994"
H="smtp.***"
2022-08-11 07:13:09 1oM0Rz-0004DZ-SN => ***@gmail.com R=smarthost T=remote_smtp
H=smtp.*** [***] X=TLS1.2:DHE-RSA-AES256-GCM-SHA384:256 C="250 OK
id=1oM0V4-0006k8-OU"
2022-08-11 07:13:09 1oM0Rz-0004DZ-SN Completed


How to reproduce?
- Send normal email.
- First - random attempt will reject
- Second attempt will accept


Note:
Before new version it works without problems for years.
This error first time appear in last 1-2 years.
It is very random.


Additional information:
We are using latest version of WHM/cPanel.

If we replay on one exact mail message it will ALWAYS reject. Is there
additional problem with length or message, body, content, DKIM or something
like that? This issue is related or different bug.

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