Configure Postfix to use Gmail as a Mail Relay

In this tutorial, I setup and Configure Postfix to use Gmail as a Mail Relay with 587 port.

• OS: Centos
• User: root

Install postfix

yum install postfix mailx cyrus-sasl cyrus-sasl-plain

To configure postfix to use Gmail as a Mail Relay

vi /etc/postfix/main.cf

Add or modify the following as below:

#To use smpt gmail with 587 port
relayhost = [smtp.gmail.com]:587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
smtp_tls_security_level = encrypt
# Location of CA certificates
smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt

To configure Gmail authentication

vi /etc/postfix/sasl_passwd

Add the line as below:

[smtp.gmail.com]:587    [email protected]:password

Running commands as below:

chmod 600 /etc/postfix/sasl_passwd
chown root:root /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db
postmap /etc/postfix/sasl_passwd

To restart postfix service

service postfix start

Test send a email 

echo "Test Mail" | mailx -v -r "A[email protected]" -s "Test Mail 01" [email protected]

Troubleshooting - Enable "Less secure apps" access

The solve problem to link: https://support.google.com/accounts/answer/6010255?hl=en

Thanks for reading Configure Postfix to use Gmail as a Mail Relay My blog Effortless Zimbra Mail Management: Unleashing the Power of Linux Commands, How-To, and Bash Scripts I hope this is useful.

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Huu Phan | Blog Linux operating system | Huu Phan ~ Zimbra Mail Server,linux,bash script,centos,linux command | www.huuphan.com

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