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How to update hostname in postfix?

Updating hostname in postfix involves updating several files. First, we need to update the following file with the new hostname:


So, we can use the following command to update the file with nano editor

nano /etc/mailname

Then, we’ll need to update the postfix configuration file that’s located at /etc/postfix/ . In the file, we’ll update the hostname with the new hostname. So, the new hostname line should be

myhostname = 

Then, we need to restart postfix service with the following command –

sudo service postfix restart

Done! Your new hostname should appear in your mail now.