I am configuring Postfix and when validating by telnet and SMTP I got the status bounced error, unknown user:
Error log:
postfix/local[18718]: 4590D7DC0A51: to=myuser@mydomain.example, relay=local, delay=9.8, delays=9.8/0.01/0/0.04, dsn=5.1.1, status=bounced (unknown user: “myuser”)
The “myuser” already exists, but with full domain name: myuser@mydomain.example.
User Validation:
postmap -q myuser@mydomain.example mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
Output is: “1” – so I guess it is OK.
My postfix Configuration:
root# postconf -n: append_at_myorigin = yes biff = no config_directory = /etc/postfix default_destination_concurrency_limit = 1 delay_warning_time = 8h disable_vrfy_command = yes dovecot_destination_concurrency_limit = 1 dovecot_destination_recipient_limit = 1 enable_original_recipient = yes local_destination_concurrency_limit = 1 maximal_queue_lifetime = 6d mydestination = mydomain.example smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated smtpd_delay_reject = no smtpd_hard_error_limit = 10 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname smtpd_recipient_restrictions = permit_mynetworks, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unlisted_recipient, reject_unauth_destination, reject_unauth_pipelining smtpd_sender_restrictions = permit_mynetworks, reject_unknown_sender_domain smtpd_soft_error_limit = 5 strict_rfc821_envelopes = yes virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf,mysql:/etc/postfix/mysql-email2email.cf virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf virtual_transport = dovecot
Solution
Remove the domain from mydestination so that it will not lookup the local users and instead forward to external SMTP server
you have added mydestination = mydomain.example and so the valid users for mydomain.example will be searched in local_recipient_maps. It is very clear from the logline that local delivery agent is selected to deliver the mail, as local domain class matched. See postfix address classes for more help
Modify your main.cf like below
#/etc/postfix/main.cf mydestination = # set to localhost localhost.$mydomain or remove mydomain.example for now # Ensure that postmap -q mydomain.example mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf is returning mydomain.example and # postmap -q myuser@mydomain.example mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf succeeds