Postfix SMTP Relay to smtp.gmail.com

In some situations it’s needed if you have an internal mail server with a dynamic IP address, or simply one server hosting an application that have one form contact for example and a mail daemon listening in localhost, it can be very useful relay smtp traffic to the gmail servers, using smtp.gmail.com, and using a valid account autheticating via SASL. It’s very easy to implement but you have to configure some rules to talk with the gmail smtp servers.

postfix_gmail_smarthost

- Edit postfix configuration:

# vi /etc/postfix/main.cf


#TLS parameters

 smtpd_use_tls=yes

 smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache

 smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

 smtp_tls_note_starttls_offer = yes

 smtp_tls_policy_maps = hash:/etc/postfix/tls_policy


#Relay host configuration

 relayhost = [smtp.gmail.com]:587


# SASL Configuration

 smtp_sasl_auth_enable = yes

 smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

 smtp_sasl_security_options = noanonymous

 smtp_sasl_mechanism_filter = plain

 smtp_sasl_tls_security_options = noanonymous


- Add relay user to send the mail:

# vi /etc/postfix/sasl_passwd

 [smtp.gmail.com]:587 user@gmail.com:Password


# postmap /etc/postfix/sasl_passwd

- Config to force the use of ssl with the gmail smtp server:

# vi /etc/postfix/tls_policy

[smtp.gmail.com]:587 encrypt

# postmap /etc/postfix/tls_policy

- Restart postfix service:

# /etc/init.d/postfix restart

- If you have problems with mail traffic and see in mail.log file the next error:

Mar 29 15:10:36 www postfix/smtp[6927]: 7B39F1232BC: SASL authentication failed; cannot authenticate to server smtp.gmail.com[173.194.70.108]: no mechanism available

Probably you need to install the package libsasl2-modules and restart postfix again.

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