I stopped postfix and dovecot, 
cleared the logs, 
started postfix and dovecot, 
attempted to send an email to smok...@sizzelicks.com (I don't see this in
the logs) and then 
attempted to create a mail account in Thunderbird for smok...@sizzelicks.com

syslog
Dec  3 19:26:55 softlinksys systemd[1]: Starting Postfix Mail Transport
Agent (instance -)...
Dec  3 19:26:55 softlinksys postfix/postfix-script[5508]: warning: symlink
leaves directory: /etc/postfix/./makedefs.out
Dec  3 19:26:56 softlinksys postfix/postfix-script[5675]: starting the
Postfix mail system
Dec  3 19:26:56 softlinksys postfix/master[5677]: daemon started -- version
3.4.13, configuration /etc/postfix
Dec  3 19:26:56 softlinksys systemd[1]: Started Postfix Mail Transport Agent
(instance -).
Dec  3 19:26:56 softlinksys systemd[1]: Starting Postfix Mail Transport
Agent...
Dec  3 19:26:56 softlinksys systemd[1]: Finished Postfix Mail Transport
Agent.
Dec  3 19:27:05 softlinksys systemd[1]: Started Dovecot IMAP/POP3 email
server.
Dec  3 19:27:05 softlinksys dovecot: master: Dovecot v2.3.7.2 (3c910f64b)
starting up for imap, pop3, lmtp (core dumps disabled)
Dec  3 19:32:10 softlinksys dovecot: imap-login: Disconnected (auth failed,
3 attempts in 14 secs): user=<smoker1>, method=PLAIN, rip=67.8.3.170,
lip=194.163.45.150, TLS, session=<cTbA9ULS2stDCAOq>

mail.log
Dec  3 19:26:55 softlinksys postfix/postfix-script[5508]: warning: symlink
leaves directory: /etc/postfix/./makedefs.out
Dec  3 19:26:56 softlinksys postfix/postfix-script[5675]: starting the
Postfix mail system
Dec  3 19:26:56 softlinksys postfix/master[5677]: daemon started -- version
3.4.13, configuration /etc/postfix
Dec  3 19:27:05 softlinksys dovecot: master: Dovecot v2.3.7.2 (3c910f64b)
starting up for imap, pop3, lmtp (core dumps disabled)
Dec  3 19:32:10 softlinksys dovecot: imap-login: Disconnected (auth failed,
3 attempts in 14 secs): user=<smoker1>, method=PLAIN, rip=67.8.3.170,
lip=194.163.45.150, TLS, session=<cTbA9ULS2stDCAOq>

-----Original Message-----
From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> On
Behalf Of Wietse Venema
Sent: Friday, December 3, 2021 1:35 PM
To: Postfix users <postfix-users@postfix.org>
Subject: Re: virtual mailbox domains??

post...@aecperformance.com:
> How can I debug/resolve this problem?

By sharing Postfix logs, in addition to Postfix configurations.

"email to X bounces" is not sufficient to determine *WHY* delivery is
failing.

        Wietse

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