Setup relayhost

Relay host is a server which can accept your email and sent it out to the final destination for you.

To setup a global relay host in iRedMail, please append below settings in Postfix config file /etc/postfix/main.cf (Linux/OpenBSD) or /usr/local/etc/postfix/main.cf (FreeBSD):

relayhost = [relay_server]:25
smtp_sasl_password_maps = hash:/etc/postfix/sasl_password
smtp_sasl_auth_enable = yes
smtp_sasl_mechanism_filter = login
smtp_sasl_security_options = noanonymous

Note

You should relace relay_server above by the real server address. for example, relayhost = [37.61.54.158]:25, relayhost = [smtp.gmail.com]:25.
For more possible values/formats, please check Postfix document: Postfix transport table format (transport).

Then write the username and password in /etc/postfix/sasl_password:

relay.server user:password

Run postmap and restart Postfix service:

postmap hash:/etc/postfix/sasl_password
service postfix restart

That's it.

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