Mail send via Relay host on Ubuntu Server

Lin­ux Serv­er

Set­up Gmail as Re­lay host

Ed­it /etc/postfix/main.cf as fol­low.

sudo nano /etc/postfix/main.cf

#Ap­ply

# This tells Postfix to hand off all messages to Gmail, and never do direct delivery.
relayhost = [smtp.gmail.com]:587

# This enables TLS (SMTPS) certificate verification, because Gmail has a valid one.
smtp_tls_security_level = verify
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_session_cache_database = btree:/var/run/smtp_tls_session_cache

# This tells Postfix to provide the username/password when Gmail asks for one.
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous

In /​​​etc/​​​postfix/​​​sasl_​​​passwd, add your Gmail user­name and ap­pli­ca­tion pass­word (see the ref­er­ences be­low).

sudo nano /etc/postfix/sasl_passwd

#Ap­ply

[smtp.gmail.com]:587    user-name@gmail.com:app-password

# Note you must setup App Password at https://myaccount.google.com/u/0/apppasswords

Com­pile the sasl_​​​passwd file in­to a data­base and re­load Postfix's main con­fig­u­ra­tion.

sudo postmap /etc/postfix/sasl_passwd && sudo postfix reload

Ref­er­ences and Notes

• Su­per User: How do I change post­fix port from 25 to 587?
• Google Sup­port: Sign in with App Pass­words
• Note: With this con­fig­u­ra­tion, all mail must be sent us­ing your Gmail ad­dress as "From", un­less you have set­up your Gmail (Set­tings>Ac­counts and Im­port>) to "Send mail as" some oth­er, then you cold use these email ad­dress­es.

Reg­is­ter: Lin­ux Serv­er

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