Our mail server (kolab 16 with postfix) has gone into a loop of some kind
leading to constant retrying of bounced emails.
Here is a segment of what I see in the maillog:
Jan 12 00:36:14 mail postfix/discard[3091]: warning: unexpected attribute
nrequest from bounce socket (expecting: flags)
Jan 12 00:36:14 mail postfix/discard[3091]: warning: deliver_request_get: error
receiving common attributes
Jan 12 00:36:14 mail postfix/smtp[3090]: 5937C8DFA2: to=<x...@icloud.com>,
relay=mx01.mail.icloud.com[17.56.9.17]:25, delay=25, delays=25/0/0.28/0,
dsn=5.3.4, status=bounced (message size 35379321 exceeds size limit 28311552 of
server mx01.mail.icloud.com[17.56.9.17])
Jan 12 00:36:14 mail postfix/qmgr[1569]: 5937C8DFA2: removed
Jan 12 00:36:16 mail postfix/smtpd[3068]: connect from xxx[127.0.0.1]
Jan 12 00:36:16 mail postfix/smtpd[3068]: 636058DFA2: client=xxx[127.0.0.1]
Jan 12 00:36:18 mail postfix/cleanup[3071]: 636058DFA2:
message-id=<2f18001d6e499$48eeff40$daccfdc0$@xxx>
Jan 12 00:36:23 mail ctl_cyrusdb[3097]: checkpointing cyrus databases
Jan 12 00:36:23 mail ctl_cyrusdb[3097]: done checkpointing cyrus databases
Jan 12 00:36:31 mail clamd[1187]: SelfCheck: Database status OK.
Jan 12 00:36:40 mail opendkim[1181]: 636058DFA2: DKIM-Signature field added
(s=20201004, d=xxx)
Jan 12 00:36:40 mail postfix/qmgr[1569]: 636058DFA2: from=<support@xxx>,
size=35379321, nrcpt=1 (queue active)
Jan 12 00:36:40 mail postfix/smtpd[3068]: disconnect from xxx[127.0.0.1]
Jan 12 00:36:41 mail postfix/discard[3091]: warning: unexpected attribute
nrequest from bounce socket (expecting: flags)
Jan 12 00:36:41 mail postfix/discard[3091]: warning: deliver_request_get: error
receiving common attributes
Jan 12 00:36:41 mail postfix/smtp[3090]: 636058DFA2: to=<x...@icloud.com>,
relay=mx02.mail.icloud.com[17.42.251.12]:25, delay=25, delays=25/0.01/0.67/0,
dsn=5.3.4, status=bounced (message size 35379321 exceeds size limit 28311552 of
server mx02.mail.icloud.com[17.42.251.12])
Jan 12 00:36:41 mail postfix/qmgr[1569]: 636058DFA2: removed
Here the email is going out to a user in icloud.com domain. The email bounces
with message size exceeding limit. Yet the server keeps on attempting to
deliver the message.
Oddly, there is another email that goes out repeatedly as well, even though it
is successful in delivering to the target domain. (the email is a couple of
weeks old and they are going crazy about these emails appearing every minute or
so).
We have tried changing various settings to no avail:
maximal_queue_lifetime = 0
bounce_queue_lifetime = 0
minimal_backoff_time = 6h
maximal_backoff_time = 6h
queue_run_delay = 6h
We receive and send other emails just fine.
What could be going wrong? Thanks in advance.
