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Setting up Sender Dependent Authentication (Sender Based Relay)
Let's say that I have 4 gmail accounts. [email protected], [email protected], [email protected] and [email protected]
My relay server is configured with an IP of 169.254.1.12.
I want mail sent by my organization to be sent through my relay as the account specified in the "From:" field of the message, and send out through [email protected] if no "From:" is specified, or it doesn't match the other 3 addresses.
After a working relay server is configured, the /etc/postfix/main.cf can be modified to add in the following lines.
smtp_sender_dependent_authentication = yes
sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay
Then, the /etc/postfix/sasl_passwd file can be modified
[email protected] [email protected]:/etc/tokens/[email protected]
[email protected] [email protected]:/etc/tokens/[email protected]
[email protected] [email protected]:/etc/tokens/[email protected]
[smtp.gmail.com]:587 [email protected]:/etc/tokens/[email protected]
Then edit the /etc/postfix/sender_relay
[email protected] [smtp.gmail.com]:587
[email protected] [smtp.gmail.com]:587
[email protected] [smtp.gmail.com]:587
Each of these accounts will need to be set up with oauth2 and have their information placed at /etc/tokens/[address] or /var/spool/postfix/etc/tokens/[address]
Don't forget to run postmap on the newly created files.
$ cd /etc/postfix
$ sudo postmap sasl_passwd sender_relay