Solution to 'User unknown in virtual alias table' Error

If you cannot receive mail and you encounter the User unknown in virtual alias table error in your mail logs, you can enter the file below.

nano /etc/postfix/main.cf

You need to check the accuracy of hostname and destination in this file.

myhostname = mail.test.com
mydestination = $myhostname, localhost.$mydomain, $mydomain

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