>Once your master.cf file is correct, it is no longer of much interest. What matters now is logs and main.cf.
Here is what I see now with the same email going out again and again: Jan 12 17:56:26 mail postfix/smtpd[17788]: connect from xxx[127.0.0.1] Jan 12 17:56:26 mail postfix/smtpd[17788]: AED108DFA2: client=xxx[127.0.0.1] Jan 12 17:56:28 mail postfix/cleanup[17791]: AED108DFA2: message-id=<2f18001d6e499$48eeff40$daccfdc0$@xxx> Jan 12 17:56:51 mail postfix/qmgr[4667]: AED108DFA2: from=<support@xxx>, size=35379321, nrcpt=1 (queue active) Jan 12 17:56:51 mail postfix/smtpd[17788]: disconnect from xxx[127.0.0.1] Jan 12 17:56:51 mail postfix/smtp[18159]: AED108DFA2: to=<x...@icloud.com>, relay=mx02.mail.icloud.com[17.57.152.14]:25, delay=25, delays=25/0.01/0.4/0, dsn=5.3.4, status=bounced (message size 35379321 exceeds size limit 28311552 of server mx02.mail.icloud.com[17.57.152.14]) Jan 12 17:56:51 mail postfix/cleanup[17853]: A0E418DFA4: message-id=<20210112175651.A0E418DFA4@xxx> Jan 12 17:56:51 mail postfix/qmgr[4667]: A0E418DFA4: from=<>, size=3867, nrcpt=1 (queue active) Jan 12 17:56:51 mail postfix/bounce[18161]: AED108DFA2: sender non-delivery notification: A0E418DFA4 Jan 12 17:56:51 mail postfix/qmgr[4667]: AED108DFA2: removed Jan 12 18:05:16 mail postfix/smtpd[18647]: disconnect from xxx[127.0.0.1] Jan 12 18:05:17 mail postfix/smtp[18775]: 9BA7A8DFA2: to=<x...@icloud.com>, relay=mx01.mail.icloud.com[17.56.9.17]:25, delay=25, delays=24/0.03/0.93/0, 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 18:05:17 mail postfix/cleanup[18778]: D21298DFA4: message-id=<20210112180517.D21298DFA4@xxx> Jan 12 18:05:17 mail postfix/qmgr[4667]: D21298DFA4: from=<>, size=3863, nrcpt=1 (queue active) Jan 12 18:05:17 mail postfix/bounce[18777]: 9BA7A8DFA2: sender non-delivery notification: D21298DFA4 Jan 12 18:05:17 mail postfix/qmgr[4667]: 9BA7A8DFA2: removed >Once the notifications are sent, the associated message is deleted from the queue. If you're not generating new bounces every minute, the volume will dissipate. If you're generating a lot of bounces, that's the problem to >solve, i.e. the *generating* part. Instead of working on throwing them away, find out why you have a high bounce rate and fix that. I am not sure why the same emails are going out even with the non-delivery reports. The clients are clearly not sending these. So, not sure what to look for. Please note that all other emails are fine (incoming and outgoing). It is just these emails that bounce that keep on getting resent. (there are also a couple of internal emails being resent, as far as I can tell from the logs, but those sends are successful yet keeps repeating)
