Email errors when receiving mail and sending mail

SYSTEM INFORMATION
OS type and version: Ubuntu

Operating system Ubuntu Linux 20.04.3
Webmin version 1.981Usermin version 1.823
Virtualmin version 6.17-3 Pro Authentic theme version 19.83-2
Kernel and CPU* Linux 5.11.0-43-generic on x86_64
Processor informationIntel(R) Xeon(R) Silver 4210 CPU @ 2.20GHz, 20 cores

Having recurring errors with email setup

Email send but not received to read user mail, usermin or SquirrelMail

When virtual_alias_maps = hash:/etc/postfix/virtual enabled no mail send or received get a message to say server not ready.

stmp failure also when sending mail from usermin, thnderbird and round cube

@dahalday,

I’d be happy to assist you getting things working, drop me a line and let’s discuss. As you are a “Pro” user, you can also shout out to @staff for assistance if you’d prefer their assistance. Between the 5 of us (VM Team + Me) I’m certain we can get things working for you.

@dahalday what error do you get in /var/log/mail.log when sending or receiving email?

Jan 6 15:07:02 domain postfix/pickup[504332]: 2315126E05D4: uid=0 from=
Jan 6 15:07:02 domain postfix/cleanup[504568]: 2315126E05D4: message-id=20220106200702.2315126E05D4@domain.com
Jan 6 15:07:02 domain postfix/qmgr[13552]: 2315126E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:07:02 domain postfix/local[506874]: 2315126E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:07:02 domain postfix/qmgr[13552]: 2315126E05D4: removed
Jan 6 15:07:45 domain postfix/smtpd[514337]: connect from unknown[163.123.142.206]
Jan 6 15:07:45 domain postfix/smtpd[514337]: warning: unknown[163.123.142.206]: SASL LOGIN authentication failed: authentication failure
Jan 6 15:07:58 domain postfix/smtpd[514337]: message repeated 12 times: [ warning: unknown[163.123.142.206]: SASL LOGIN authentication failed: authentication failure]
Jan 6 15:08:01 domain postfix/pickup[504332]: 9943F26E05D4: uid=0 from=
Jan 6 15:08:01 domain postfix/cleanup[504568]: 9943F26E05D4: message-id=20220106200801.9943F26E05D4@domain.com
Jan 6 15:08:01 domain postfix/qmgr[13552]: 9943F26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:08:01 domain postfix/local[506874]: 9943F26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:08:01 domain postfix/qmgr[13552]: 9943F26E05D4: removed
Jan 6 15:08:03 domain postfix/smtpd[514337]: warning: unknown[163.123.142.206]: SASL LOGIN authentication failed: authentication failure
Jan 6 15:08:28 domain postfix/smtpd[514337]: message repeated 6 times: [ warning: unknown[163.123.142.206]: SASL LOGIN authentication failed: authentication failure]
Jan 6 15:08:30 domain postfix/smtpd[514337]: too many errors after AUTH from unknown[163.123.142.206]
Jan 6 15:08:30 domain postfix/smtpd[514337]: disconnect from unknown[163.123.142.206] ehlo=1 auth=0/20 rset=20 commands=21/41
Jan 6 15:09:02 domain postfix/pickup[504332]: 1B18B26E05D4: uid=0 from=
Jan 6 15:09:02 domain postfix/cleanup[504568]: 1B18B26E05D4: message-id=20220106200902.1B18B26E05D4@domain.com
Jan 6 15:09:02 domain postfix/qmgr[13552]: 1B18B26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:09:02 domain postfix/local[506874]: 1B18B26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.01, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:09:02 domain postfix/qmgr[13552]: 1B18B26E05D4: removed
Jan 6 15:10:01 domain postfix/pickup[504332]: 943BE26E05D4: uid=0 from=
Jan 6 15:10:01 domain postfix/cleanup[504568]: 943BE26E05D4: message-id=20220106201001.943BE26E05D4@domain.com
Jan 6 15:10:01 domain postfix/qmgr[13552]: 943BE26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:10:01 domain postfix/local[506874]: 943BE26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.03, delays=0.02/0/0/0.01, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:10:01 domain postfix/qmgr[13552]: 943BE26E05D4: removed
Jan 6 15:11:02 domain postfix/pickup[504332]: 2262826E05D4: uid=0 from=
Jan 6 15:11:02 domain postfix/cleanup[504568]: 2262826E05D4: message-id=20220106201102.2262826E05D4@domain.com
Jan 6 15:11:02 domain postfix/qmgr[13552]: 2262826E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:11:02 domain postfix/local[506874]: 2262826E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:11:02 domain postfix/qmgr[13552]: 2262826E05D4: removed
Jan 6 15:11:50 domain postfix/anvil[511933]: statistics: max connection rate 1/60s for (192.168.0.36:smtp:107.182.128.54) at Jan 6 15:04:34
Jan 6 15:11:50 domain postfix/anvil[511933]: statistics: max connection count 1 for (192.168.0.36:smtp:107.182.128.54) at Jan 6 15:04:34
Jan 6 15:11:50 domain postfix/anvil[511933]: statistics: max cache size 1 at Jan 6 15:04:34
Jan 6 15:12:01 domain postfix/pickup[504332]: 978FF26E05D4: uid=0 from=
Jan 6 15:12:01 domain postfix/cleanup[504568]: 978FF26E05D4: message-id=20220106201201.978FF26E05D4@domain.com
Jan 6 15:12:01 domain postfix/qmgr[13552]: 978FF26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:12:01 domain postfix/local[506874]: 978FF26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:12:01 domain postfix/qmgr[13552]: 978FF26E05D4: removed
Jan 6 15:12:20 domain postfix/pickup[504332]: B4D0B26E05D4: uid=33 from=
Jan 6 15:12:20 domain postfix/cleanup[504568]: B4D0B26E05D4: message-id=20220106201220.B4D0B26E05D4@domain.com
Jan 6 15:12:20 domain postfix/qmgr[13552]: B4D0B26E05D4: from=www-data@domain.com, size=4603, nrcpt=1 (queue active)
Jan 6 15:12:20 domain postfix/local[506874]: B4D0B26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:12:20 domain postfix/qmgr[13552]: B4D0B26E05D4: removed
Jan 6 15:13:02 domain postfix/pickup[504332]: 3675526E05D4: uid=0 from=
Jan 6 15:13:02 domain postfix/cleanup[504568]: 3675526E05D4: message-id=20220106201302.3675526E05D4@domain.com
Jan 6 15:13:02 domain postfix/qmgr[13552]: 3675526E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:13:02 domain postfix/local[506874]: 3675526E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:13:02 domain postfix/qmgr[13552]: 3675526E05D4: removed
Jan 6 15:14:01 domain postfix/pickup[504332]: AAC2F26E05D4: uid=0 from=
Jan 6 15:14:01 domain postfix/cleanup[504568]: AAC2F26E05D4: message-id=20220106201401.AAC2F26E05D4@domain.com
Jan 6 15:14:01 domain postfix/qmgr[13552]: AAC2F26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:14:01 domain postfix/local[506874]: AAC2F26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:14:01 domain postfix/qmgr[13552]: AAC2F26E05D4: removed
Jan 6 15:15:02 domain postfix/pickup[504332]: 3199926E05D4: uid=0 from=
Jan 6 15:15:02 domain postfix/cleanup[504568]: 3199926E05D4: message-id=20220106201502.3199926E05D4@domain.com
Jan 6 15:15:02 domain postfix/qmgr[13552]: 3199926E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:15:02 domain postfix/local[506874]: 3199926E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.03, delays=0.02/0/0/0.01, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:15:02 domain postfix/qmgr[13552]: 3199926E05D4: removed
Jan 6 15:16:01 domain postfix/pickup[504332]: A52C326E05D4: uid=0 from=
Jan 6 15:16:01 domain postfix/cleanup[504568]: A52C326E05D4: message-id=20220106201601.A52C326E05D4@domain.com
Jan 6 15:16:01 domain postfix/qmgr[13552]: A52C326E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:16:01 domain postfix/local[506874]: A52C326E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:16:01 domain postfix/qmgr[13552]: A52C326E05D4: removed
Jan 6 15:17:02 domain postfix/pickup[504332]: 267C826E05D4: uid=0 from=
Jan 6 15:17:02 domain postfix/cleanup[504568]: 267C826E05D4: message-id=20220106201702.267C826E05D4@domain.com
Jan 6 15:17:02 domain postfix/qmgr[13552]: 267C826E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:17:02 domain postfix/local[506874]: 267C826E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:17:02 domain postfix/qmgr[13552]: 267C826E05D4: removed
Jan 6 15:18:01 domain postfix/pickup[504332]: 9CAC726E05D4: uid=0 from=
Jan 6 15:18:01 domain postfix/cleanup[504568]: 9CAC726E05D4: message-id=20220106201801.9CAC726E05D4@domain.com
Jan 6 15:18:01 domain postfix/qmgr[13552]: 9CAC726E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:18:01 domain postfix/local[506874]: 9CAC726E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:18:01 domain postfix/qmgr[13552]: 9CAC726E05D4: removed
Jan 6 15:19:02 domain postfix/pickup[504332]: 1EFDB26E05D4: uid=0 from=
Jan 6 15:19:02 domain postfix/cleanup[504568]: 1EFDB26E05D4: message-id=20220106201902.1EFDB26E05D4@domain.com
Jan 6 15:19:02 domain postfix/qmgr[13552]: 1EFDB26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:19:02 domain postfix/local[506874]: 1EFDB26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:19:02 domain postfix/qmgr[13552]: 1EFDB26E05D4: removed
Jan 6 15:20:01 domain postfix/pickup[504332]: 952EE26E05D4: uid=0 from=
Jan 6 15:20:01 domain postfix/cleanup[504568]: 952EE26E05D4: message-id=20220106202001.952EE26E05D4@domain.com
Jan 6 15:20:01 domain postfix/qmgr[13552]: 952EE26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:20:01 domain postfix/local[506874]: 952EE26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:20:01 domain postfix/qmgr[13552]: 952EE26E05D4: removed
Jan 6 15:21:02 domain postfix/pickup[504332]: 1687226E05D4: uid=0 from=
Jan 6 15:21:02 domain postfix/cleanup[504568]: 1687226E05D4: message-id=20220106202102.1687226E05D4@domain.com
Jan 6 15:21:02 domain postfix/qmgr[13552]: 1687226E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:21:02 domain postfix/local[506874]: 1687226E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:21:02 domain postfix/qmgr[13552]: 1687226E05D4: removed
Jan 6 15:22:01 domain postfix/pickup[504332]: 8BEAC26E05D4: uid=0 from=
Jan 6 15:22:01 domain postfix/cleanup[504568]: 8BEAC26E05D4: message-id=20220106202201.8BEAC26E05D4@domain.com
Jan 6 15:22:01 domain postfix/qmgr[13552]: 8BEAC26E05D4: from=root@domain.com, size=1221, nrcpt=1 (queue active)
Jan 6 15:22:01 domain postfix/local[506874]: 8BEAC26E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:22:01 domain postfix/qmgr[13552]: 8BEAC26E05D4: removed
Jan 6 15:22:18 domain postfix/pickup[504332]: 19E8926E05D4: uid=33 from=
Jan 6 15:22:18 domain postfix/cleanup[504568]: 19E8926E05D4: message-id=20220106202218.19E8926E05D4@domain.com
Jan 6 15:22:18 domain postfix/qmgr[13552]: 19E8926E05D4: from=www-data@domain.com, size=4603, nrcpt=1 (queue active)
Jan 6 15:22:18 domain postfix/local[506874]: 19E8926E05D4: to=root@domain.com, orig_to=, relay=local, delay=0.03, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered to command: procmail -a “$EXTENSION”)
Jan 6 15:22:18 domain postfix/qmgr[13552]: 19E8926E05D4: removed

/var/log/mail.err

Jan 3 23:25:45 domain postfix/master[489357]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:25:46 domain postfix/postfix-script[491482]: fatal: the Postfix mail system is not running
Jan 3 23:25:58 domain postfix/master[493028]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:25:59 domain postfix/master[493027]: fatal: daemon initialization failure
Jan 3 23:26:01 domain postfix/postfix-script[493029]: fatal: mail system startup failed
Jan 3 23:26:10 domain postfix/master[494585]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:26:11 domain postfix/master[494584]: fatal: daemon initialization failure
Jan 3 23:26:12 domain postfix/postfix-script[494586]: fatal: mail system startup failed
Jan 3 23:28:08 domain postfix/master[500549]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:28:09 domain postfix/master[500548]: fatal: daemon initialization failure
Jan 3 23:28:10 domain postfix/postfix-script[500550]: fatal: mail system startup failed
Jan 3 23:30:35 domain postfix/master[502370]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:30:36 domain postfix/postfix-script[506247]: fatal: the Postfix mail system is not running
Jan 3 23:30:53 domain postfix/master[507798]: fatal: bind 192.168.0.36 port 25: Address already in use
Jan 3 23:30:54 domain postfix/master[507797]: fatal: daemon initialization failure
Jan 3 23:30:55 domain postfix/postfix-script[507808]: fatal: mail system startup failed
Jan 3 23:34:30 domain postfix/master[509833]: fatal: bind 0.0.0.0 port 25: Address already in use
Jan 3 23:34:31 domain postfix/postfix-script[511282]: fatal: the Postfix mail system is not running
Jan 3 23:34:42 domain postfix/master[512816]: fatal: bind 192.168.0.36 port 25: Address already in use
Jan 3 23:34:43 domain postfix/master[512815]: fatal: daemon initialization failure
Jan 3 23:34:44 domain postfix/postfix-script[512817]: fatal: mail system startup failed
Jan 3 23:35:44 domain postfix/master[516968]: fatal: /etc/postfix/master.cf: line 12: inet service cannot be private
Jan 3 23:35:45 domain postfix/master[516967]: fatal: daemon initialization failure
Jan 3 23:35:46 domain postfix/postfix-script[516987]: fatal: mail system startup failed
Jan 3 23:35:56 domain postfix/master[518600]: fatal: /etc/postfix/master.cf: line 12: inet service cannot be private
Jan 3 23:35:57 domain postfix/master[518599]: fatal: daemon initialization failure
Jan 3 23:35:58 domain postfix/postfix-script[518620]: fatal: mail system startup failed
Jan 4 18:47:39 domain postfix/smtpd[5444]: fatal: no SASL authentication mechanisms
Jan 4 18:48:40 domain postfix/smtpd[5495]: fatal: no SASL authentication mechanisms
Jan 4 18:53:58 domain postfix/smtpd[8848]: fatal: no SASL authentication mechanisms
Jan 4 18:55:11 domain postfix/smtpd[9840]: fatal: no SASL authentication mechanisms
Jan 4 19:02:14 domain postfix/smtpd[13483]: fatal: no SASL authentication mechanisms
Jan 4 19:03:46 domain postfix/smtpd[13531]: fatal: no SASL authentication mechanisms
Jan 4 19:16:14 domain dovecot: imap(info@domain.com)<37999><9xBmqcrUeMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:20:53 domain dovecot: imap(info@domain.com)<41771><6uAGusrUlMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:30 domain dovecot: imap(info-domain.com)<42506><2obPv8rUrMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:31 domain dovecot: imap(info-domain.com)<42569><Njvnv8rUrsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:31 domain dovecot: imap(info-domain.com)<42573><uR/ov8rUsMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:31 domain dovecot: imap(info-domain.com)<42575><ldPpv8rUssl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:31 domain dovecot: imap(info-domain.com)<42577><UjHqv8rUtMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:32 domain dovecot: imap(info-domain.com)<42579><Ba3sv8rUtsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:32 domain dovecot: imap(info-domain.com)<42581><Egzvv8rUuMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:32 domain dovecot: imap(info-domain.com)<42584><PWDyv8rUusl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:37 domain dovecot: imap(info-domain.com)<42591><VdE5wMrUvMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:37 domain dovecot: imap(info-domain.com)<42593><AGE6wMrUvsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:37 domain dovecot: imap(info-domain.com)<42596><q7o9wMrUwMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:38 domain dovecot: imap(info-domain.com)<42601><GSFMwMrUwsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:41 domain dovecot: imap(info-domain.com)<42617><4KZ4wMrUxMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:41 domain dovecot: imap(info-domain.com)<42619><GxN6wMrUxsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:41 domain dovecot: imap(info-domain.com)<42622><R4t8wMrUyMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:55 domain dovecot: imap(info-domain.com)<42650><PtBRwcrUzMl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:58 domain dovecot: imap(info-domain.com)<42663><rtWFwcrUzsl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42670><BVyRwcrU0Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42672><yRySwcrU0sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42675><0zOUwcrU1Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42676><vFaUwcrU1sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42681><jWSXwcrU2Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:22:59 domain dovecot: imap(info-domain.com)<42682><9oWXwcrU2sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:01 domain dovecot: imap(info-domain.com)<42687><kc2qwcrU3Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:17 domain dovecot: imap(info-domain.com)<42719><M6mewsrU4Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:17 domain dovecot: imap(info-domain.com)<42722><okigwsrU4sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:17 domain dovecot: imap(info-domain.com)<42724><YmSiwsrU5Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:32 domain dovecot: imap(info-domain.com)<42744><+C+Bw8rU5sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:49 domain dovecot: imap(info-domain.com)<42753><QoyKxMrU6Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:49 domain dovecot: imap(info-domain.com)<42755><5RKMxMrU6sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:49 domain dovecot: imap(info-domain.com)<42758><ZGmOxMrU7Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:51 domain dovecot: imap(info-domain.com)<42761><RcCuxMrU7sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:58 domain dovecot: imap(info-domain.com)<42775><B7gVxcrU8Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:58 domain dovecot: imap(info-domain.com)<42778><4yIXxcrU8sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:23:58 domain dovecot: imap(info-domain.com)<42780><WH8ZxcrU9Ml/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:24:00 domain dovecot: imap(info-domain.com)<42785><xQovxcrU9sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:24:05 domain dovecot: imap(info-domain.com)<42804><DMJ+xcrU+sl/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:08 domain dovecot: imap(info@domain.com)<45147><DQPQzMrUAsp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:09 domain dovecot: imap(info@domain.com)<45156><sTDnzMrUBMp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:09 domain dovecot: imap(info@domain.com)<45160><qoTozMrUBsp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:09 domain dovecot: imap(info@domain.com)<45165><TFrqzMrUCMp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:09 domain dovecot: imap(info@domain.com)<45166><0n3qzMrUCsp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 19:26:30 domain dovecot: imap(info@domain.com)<45209><wHUpzsrUDMp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 22:33:33 domain dovecot: imap(info@domain.com)<134715><5EoVa83UPM1/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 22:38:46 domain dovecot: imap(info@domain.com)<138530><MYq9fc3UTM1/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 22:41:12 domain dovecot: imap(info@domain.com)<141439><calths3UXs1/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 22:48:03 domain dovecot: imap(info@domain.com)<146149><2/rsns3UfM1/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 4 22:48:10 domain dovecot: imap(info@domain.com)<146154><J+xgn83Ufs1/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 5 19:15:45 domain dovecot: imap(info@domain.com)<942358><zk6Jxd7UAoJ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info
Jan 5 23:42:47 domain postfix/postfix-script[12200]: fatal: the Postfix mail system is not running
Jan 6 01:17:25 domain dovecot: imap(domain.ddns.net)<94443><aZvz0uPU5oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:26 domain dovecot: imap(domain.ddns.net)<94453><3FUK0+PU6IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:27 domain dovecot: imap(domain.ddns.net)<94458><D9cL0+PU6oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:27 domain dovecot: imap(domain.ddns.net)<94462><ZM0N0+PU7IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:27 domain dovecot: imap(domain.ddns.net)<94463><A/MN0+PU7oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:38 domain dovecot: imap(domain.ddns.net)<94485><P1C+0+PU8IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:44 domain dovecot: imap(domain.ddns.net)<94510><sYUY1OPU9IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:48 domain dovecot: imap(domain.ddns.net)<94523><DQBP1OPU9oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:48 domain dovecot: imap(domain.ddns.net)<94531><1tZa1OPU+IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:48 domain dovecot: imap(domain.ddns.net)<94533><w0hb1OPU+oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:49 domain dovecot: imap(domain.ddns.net)<94535><DE9d1OPU/IZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:49 domain dovecot: imap(domain.ddns.net)<94537><DMpd1OPU/oZ/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:49 domain dovecot: imap(domain.ddns.net)<94541><23Bg1OPUAId/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 01:17:49 domain dovecot: imap(domain.ddns.net)<94543><P/Bg1OPUAod/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain.ddns.net
Jan 6 13:35:56 domain dovecot: imap(info@domain.com)<461206><TqUTJO7UNJp/AAAB>: Error: Namespace ‘’: Mail storage autodetection failed with home=/home/domain/homes/info

As a tip, few things to pay attention to:

  1. Double check that package libsasl2-modules is installed
  2. Restarting the following services should not produce any errors:
    systemctl restart saslauthd
    systemctl restart postfix
    systemctl restart dovecot
    
  3. Your IP is not blocked by fail2ban service

Thank you everyone

This is what worked so far

https://www.howtoforge.com/community/threads/changing-from-mbox-to-maildir-after-installing-ispconfig.4162/

Also ensure

Procmail Mail Filter

Action to take Conditions Move Add
Set variable LOGFILE to /var/log/procmail.log
Set variable TRAP to /etc/webmin/virtual-server/procmail-logger.pl
Set variable VIRTUALMIN Always execute action
Set variable EXITCODE to $?
Append to file /dev/null Exit status of command /usr/bin/test “$EXITCODE” = “73”
Set variable EXITCODE to 0
Execute conditional block Exit status of command /usr/bin/test “$VIRTUALMIN” != “”
Set variable ORGMAIL to $HOME/Maildir/
Set variable DEFAULT to $HOME/Maildir/
Set variable DROPPRIVS to yes
Append to file $DEFAULT Always execute action

Now I am having an issue with new email mapping user-domain.com instead of user@domain.com