E-Mail server hosting

Everything in the following page is directly taken (and adjusted to my liking) from The Gentoo Virtual Mail Server guide which is a deep and very detailed read on the topic. I will stray a little bit from that guide.

WIP

I will show you how to install and interconnect:

• Postfix, the MTA (Mail Transfer Agent)
• Dovecot, the IMAP server
• NGINX + PHP-FPM for web access (admin console + webmail)
• PostfixAdmin, the email configuration WEB gui
• Roundcube
• OpenDKIM
• OpenDMARC
• Spamassassin

Install Postfix and Dovecot

USE flags:

echo "*/* maildir dovecot sasl" >> /etc/portage/package.use/mailserver
echo "net-mail/dovecot managesieve sqlite lz4" >> /etc/portage/package.use/mailserver
echo "mail-mta/postfix dovecot-sasl sqlite -sasl" >> /etc/portage/package.use/mailserver 

Emerge the servers:

emerge -vp postfix dovecot

postfixadmin and roundcube will be installed manually and not via Gentoo portage, to avoid upgrade issues.