All of my computers have ssmtp installed. This allows any program that uses the 'sendmail' command to send mail via the Gmail SMTP server to work. I just have to put my Gmail credentials in the /etc/ssmtp/ssmtp.conf file. Not all software uses the 'sendmail' command, however. Some programs prefer to talk directly to an SMTP server. This means I have to configure each program with my Gmail credentials. I would prefer only having a single location to maintain those credentials, because I do change my Gmail password. I decided to set up Postfix as my home SMTP server.
With Gentoo, I just run 'emerge postfix'. Postfix gets installed and ssmtp gets uninstalled (since you can only have one sendmail command). There is a handy Ubuntu guide on configuring Postfix to forward to Gmail. There are a few differences in the guide between Ubuntu and Gentoo. The sasl password file is /etc/postfix/saslpass, not /etc/postfix/sasl_passwd. The Gentoo Postfix package does not contain a CA certs file. In Gentoo, there is an app-misc/ca-certificates package that contains the CA certs for every application. The certs file can be found at /etc/ssl/certs/cacert.org.pem.
From here on out, I can configure ssmtp on all my other computers to forward to my Postfix server. I can also take my Gmail credentials out of my Jenkins server.
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