- Plesk for Linux
How to set up Postfix to send emails using Gmail Relay with authentication?
Note: This article provides an example general configuration which should be performed on your own.
Set up the relay with authentication using smtp.gmail.com as a relay host in the following way:
Go to the following link: Manage your account access and security settings . Scroll down to “Password & sign-in method” and click 2-Step Verification . Enable it.
Click the following link to Generate an App password for Postfix.
Click Select app and choose Other (custom name) from the drop-down menu. Enter “Postfix” and click Generate . Save the password.
- Log in to Plesk server using SSH.
Open or create the
/etc/postfix/sasl/sasl_passwdfile and add the SMTP Host, username, and password information:
CONFIG_TEXT: [smtp.gmail.com]:587 firstname.lastname@example.org:password
Use the password from the 3d step.
Create the hash db file for Postfix by running the
# postmap /etc/postfix/sasl/sasl_passwd
Run the following commands to change the ownership to root and update the permissions for the two files:
# sudo chown root:root /etc/postfix/sasl/sasl_passwd /etc/postfix/sasl/sasl_passwd.db
# sudo chmod 0600 /etc/postfix/sasl/sasl_passwd /etc/postfix/sasl/sasl_passwd.db
Find and modify
/etc/postfix/main.cfto match the following example:
CONFIG_TEXT: relayhost = [smtp.gmail.com]:587Set this in the end of
CONFIG_TEXT: # Enable SASL authentication
smtp_sasl_auth_enable = yes
# Disallow methods that allow anonymous authentication
smtp_sasl_security_options = noanonymous
# Location of sasl_passwd
smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
# Enable STARTTLS encryption
smtp_tls_security_level = encrypt
# Location of CA certificates
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
# service postfix restart