Let us take a closer look into the postfix status bounced error in detail. At Bobcares our server management support services will give you a detailed step-by-step guide on how to solve the error.

Postfix

It is a well-known Mail Transfer Agent (MTA) that can determine routes and send emails. This cross-platform server is open-source, free, and available for installation on most UNIX-like operating systems. Postfix includes numerous client and server programs. The latter usually runs in the background, while the former is in employment by user or administrator programs. Postfix’s structure is modular and of several small, self-contained executables. There are also various parameters, features, and options available.

Status bounced

The postfix status bounced is usually shown within an error code as shown below:

error :
status=bounced (unknown user: "username")

This is a simple fix. Look for the mydestination = line in the Postfix main.cf file. Restart Postfix after removing the mydomain.com entry from the line. Check to see if the mydestination = mydomain.1234, is in mention, in which case the valid users for mydomain.abcd will be present in the local recipient maps. The logline might clearly show that a local delivery agent is in employment to deliver the mail because the local domain class matched. This triggers the postfix status bounced error.

1. firstly, modify main.cf as follows:

   #/etc/postfix/main.cf
mydestination =
# Ensure that postmap -q mydomain.abcd mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf is returning mydomain.abcd and
# postmap -q user@mydomain.abcd mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf succeeds
2. And, In /var/postfix/main.cf, make the following changes and apply the configurations. myorigin = localhost myhostname = mydestination = localhost.$mydomain, localhost, localhost.localdomain

   it is followed by:

   sudo postmap /etc/postfix/virtual
sudo service postfix restart
3. After that, open or navigate to the Postfix config file as shown below:

   sudo nano /etc/postfix/main.cf

   Then, scroll down and look for myhostname and mydestination entries. Change the postfix appearance to as shown below for configuring the postfix status bounced error:

   /etc/postfix/main.cf smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination myhostname = localhost alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

This forces Postfix to always use the external email server, even if the email recipient has a local domain name, such as user@userdomain.com thereby eliminating the postfix status bounced error.

Finally, restart the Postfix, After the configuration, the error won’t open up anymore. Type in the command given below for rebooting the Postfix:

sudo systemctl restart postfix

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Conclusion

To conclude, it is easy to tackle the postfix bounced issue. The error can be removed by restarting the Postfix after removing the mydomain.com entry from the line.