How to update hostname in postfix?

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:

/etc/mailname

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/main.cf . In the file, we’ll update the hostname with the new hostname. So, the new hostname line should be

myhostname = newhost.yourdomain.com 

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.