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Postfix to use a third party SMTP server

3 Mar
March 3, 2022 Matthew

This instructs postfix to use a third party SMTP server. It’s useful when you want to relay e-mail from an internal server which uses a dynamic IP address.

Ensure postfix is installed, and let’s have all e-mail sent to root relay to an external e-mail address:

nano /etc/postfix/sender_canonical


root     youremail@provider.tld


Postfix requires the modifications to be hashed:


postmap hash:/etc/postfix/sender_canonical
postconf -e "sender_canonical_maps=hash:/etc/postfix/sender_canonical"


Now let’s instruct postfix to use third party SMTP to route e-mail:


nano /etc/postfix/main.cf
relayhost = yoursmtp.provider.tld
service postfix restart


Finally update system aliases:


nano /etc/aliases
root:   email@domain.tld
newaliases

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