SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting and Conformance) are email authentication protocols that are becoming increasingly necessary to run a working email server. Even if you have valid MX, A, and PTR DNS records for your mail server, you may find that your emails are getting rejected […]
So you want to set up a webmail system. SquirrelMail was a fine community-supported project for many years, but as of July 2017 it seems to have been abandoned by its developers, so we’re going to use Roundcube for our webmail system instead. This guide assumes you have Ubuntu 16 running a MariaDB-Postfix-Dovecot email server […]
Note: This article describes setting up SpamAssassin 3 to work with a Postfix/Dovecot email server on Ubuntu 16, and it applies to other Debian/Ubuntu variants that use systemd. There are some significant differences in the SpamAssassin config between distros that use systemd and those that use upstart. For the Ubuntu 12/14 version of this article, […]
My previous instructions for setting up a Postfix/Dovecot/MySQL mail server on Ubuntu 12.04 work mostly as-is for Ubuntu 16.04, but there are a couple of gotchas. These workarounds are necessary due to some different locations of utilities on the filesystem and some changes to Ubuntu’s internals. We’ll go through these differences one by one. Mail […]
————— Update July 2017: SquirrelMail seems to have been abandoned by its developer. I’d strongly consider using Roundcube instead. ————— So now you have an Ubuntu 12.04 mail server set up with Postfix, Dovecot, virtual users, and a spam filtering system. But you have another problem: your IT department at work won’t let you add […]
——————–Note: This article pertains to Ubuntu 12, and it applies to versions of Ubuntu or Debian that use init rather than systemd. To install SpamAssassin on Ubuntu 15+, see the instructions here.——————– In our previous installment, we set up a Postfix and Dovecot mail server with virtual domains and users on Ubuntu 12.04. It works […]
————— Update November 2021: Added instructions for using Dovecot and Postfix with Let’s Encrypt. Also adjusted Postfix config to block auth attempts over port 25. This setup will get you 90%+ on mail server security tests. ————— ————— Update November 2020: If you’re on Ubuntu 20.04, these instructions still mostly work as written. There is […]