Hi,
when a specific company send an email to us we receive the messages many
times, but only if they insert into recipients about 50 email address of
the same domain, if they sent the same email to only one recipients all
works fine.
After some investigation, with "full-log-dir" enabled, we discovered
that our qmail send a "421 timeout" to remote server but when the email
is already accepted, so the remote server try again and so on.
Debug log, please note the delay from the last . and the error, five
minutes and note that "421 timeout" error was sent before of "250 ok"
from qmail:
========
[...]
03/02/2021 12:03:00 FROM REMOTE TO CHILD: 3 bytes TLS
.
03/02/2021 12:08:01 LOG OUTPUT TLS
ERROR(tls_write()@tls.c:678): unable to write to SSL/TLS stream: The
operation failed due to an I/O error, Connection reset by peer
ERROR(output_writeln()@log.c:104): unable to write 37 bytes to file
descriptor 1: Connection reset by peer
03/02/2021 12:08:01 FROM SPAMDYKE TO REMOTE: 37 bytes TLS
421 Timeout. Talk faster next time.
03/02/2021 12:08:01 LOG OUTPUT TLS
TIMEOUT from: u...@company.biz to: u...@partnercompany.biz origin_ip:
40.107.3.43 origin_rdns:
mail-eopbgr30043.outbound.protection.outlook.com auth: (unknown)
encryption: TLS reason: TIMEOUT
03/02/2021 12:10:06 FROM CHILD, FILTERED: 28 bytes TLS
250 ok 1614683406 qp 12548
03/02/2021 12:10:06 - TLS ended and closed
03/02/2021 12:10:06 CLOSED
========
So I set the timeout from 600 to 1200 in qmail-smtpd, remove
"idle-timeout" from spamdyke, and disable the softlimit, the error
change but the problem is still present:
========
03/02/2021 13:59:27 FROM REMOTE TO CHILD: 3 bytes TLS
.
03/02/2021 14:06:34 LOG OUTPUT TLS
ERROR(tls_write()@tls.c:678): unable to write to SSL/TLS stream: The
operation failed due to an I/O error, Connection reset by peer
ERROR(output_writeln()@log.c:104): unable to write 26 bytes to file
descriptor 1: Connection reset by peer
03/02/2021 14:06:34 FROM CHILD TO REMOTE: 26 bytes TLS
250 ok 1614690394 qp 765
03/02/2021 14:06:34 LOG OUTPUT TLS
ALLOWED from: u...@company.biz to: u...@partnercompany.biz origin_ip:
40.107.0.68 origin_rdns: mail-eopbgr00068.outbound.protect
ion.outlook.com auth: (unknown) encryption: TLS reason:
250_ok_1614690394_qp_765
[...]
ALLOWED from: us...@company.biz to: us...@partnercompany.biz origin_ip:
40.107.0.68 origin_rdns:
mail-eopbgr00068.outbound.protection.outlook.com auth: (unknown)
encryption: TLS reason: 250_ok_1614690394_qp_765
ERROR(tls_read()@tls.c:620): unable to read from SSL/TLS stream: The
operation failed due to an I/O error, Unexpected EOF found
03/02/2021 14:06:34 - TLS ended and closed
03/02/2021 14:06:34 CLOSED
========
Any suggestions?
Thanks
--
Alessio Cecchi
Postmaster @ http://www.qboxmail.it
https://www.linkedin.com/in/alessice
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