Setting Up OpenSMTPD SMTP Email Relay to Google Gmail with FreeBSD
Running your own email server can be quite rewarding. You are in charge of your data. It also allows you more flexibility with your delivery options. However, there are a few challenges. You run the risk of opening your server up to vulnerabilities, as well as making your server a potential relay for spammers to use. This guide is clearly aimed at those experienced with FreeBSD, networking, DNS, and email. If you don't know the difference between an MTA or MDA, this guide is probably not for you...