Sending email via Gmail relay through postfix

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Sending email via Gmail relay through postfix

To send email via Gmail relay through postfix use:

1. Configure gmail to use less secure apps using:
   1. Login into Gmail account and go to Settings -> Accounts -> Google Account Settings
   2. In "Google Account Settings" go to Sign-in and Security.
   3. In Sign-in and security change "Allow less secure apps:" to ON
2. yum -y install cyrus-sasl cyrus-sasl-plain cyrus-sasl-lib
3. edit /etc/postfix/sasl_passwd and put something like

   smtp.gmail.com	<gmail-email-address>:<gmail-password>

4. cd /etc/postfix
5. chmod 600 sasl_passwd
6. postmap hash:/etc/postfix/sasl_passwd
7. edit /etc/postfix/main.cf and after relayhost comment lines insert

   smtp_sasl_auth_enable = yes
   smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
   smtp_sasl_security_options =
   smtp_tls_security_level = may
   relayhost = smtp.gmail.com:587

8. service postfix restart
9. echo "Test email using postfix" | mail -s "Gmail relay test" saurabh@sbarjatiya.com
10. Look for successful email being sent or errors logs using:

    mailq
    tail -50 /var/log/maillog

    Logging into above configured "Less secure Gmail" account via browser also helps

To troubleshoot look at /var/log/maillog. In log lines look at value of ctladdr such as 'ctladdr=saurabh (501/501)'. Then look at /var/mail/saurabh or login as user saurabh and use 'mail' command to see error message sent by Gmail server.

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