Radim Burget Radim Burget - 1 month ago 7x
Linux Question

Postfix - status=bounced (unknown user "myuser")

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=, 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.com.

User Validation:

postmap -q myuser@mydomain.com 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.com
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

Thank you for any help.


you have added mydestination = mydomain.com and so the valid users for mydomain.com 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

mydestination = 
# set to localhost localhost.$mydomain or remove mydomain.com for now
# Ensure that postmap -q mydomain.com mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf is returning mydomain.com and 
# postmap -q myuser@mydomain.com mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf succeeds