How to Relay Emails to Gmail

Introduction

This tutorial applies to RHEL 8 based operating systems (CentOS, Rocky Linux)

Two machines that send emails are:

• vav.combpio.ucsf.edu
• bksmailman.compbio.ucsf.edu

Relaying emails through gmail will make it more secure and trustworthy.

Instructions

Reference Tutorial

1. Create a gmail account OR Ask Khanh for docking.email@gmail.com for credentials.
2. Disable pre-installed 'sendmail' package

   • rpm -q sendmail (Check for package)
     systemctl disbale sendmail --now (Disable package)

3. Enable smtp in firewall

   • firewall-cmd --permanent --add-service=smtp

4. Install Postfix and other dependencies

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

5. Configure Postfix