A POP server is simple and lightweight you can serve thousands of users from a single box. POP3: Post-office protocol, the simplest protocol for moving messages from an SMTP server to your mail client.MUA: Mail user agent, your local mail client such as Evolution, KMail, Claws Mail, or Thunderbird.MTA: Mail transfer agent, a simple mail transfer protocol (SMTP) server such as Postfix, Exim, and Sendmail.LetвЂ™s take a quick look at some terminology, because it is nice when we know what the heck weвЂ™re talking about. These are documented everywhere, so please do your homework and be careful. Then later, you can adapt a LAN server to an Internet-accessible server by registering your domain name and configuring your firewall accordingly. You should have LAN name services already enabled and working see Dnsmasq For Easy LAN Name Services for some pointers. OpenSSL also supplies some nice tools for testing your mail server.ДЇor simplicity, weвЂ™ll set up a LAN mail server in this series. You must secure your email sessions, so weвЂ™ll use OpenSSL. Dovecot is more lightweight and easier to configure. Exim is DebianвЂ™s default MTA it is more lightweight than Postfix and super-configurable, so weвЂ™ll look at Exim in a future tutorial.Дovecot and Courier are two popular and excellent IMAP/POP3 servers.

Postfix is a reliable old standby that is easier to configure and use than Sendmail, the original Unix MTA (does anyone still use Sendmail?). In this series, weвЂ™ll put together a nice reliable configurable mail server with Postfix, Dovecot, and OpenSSL on Ubuntu Linux. ItвЂ™s still a dance of many steps and knitting together several different servers, and once you put it all together it just sits there, all nice and stable, instead of winking in and out of existence like microservices. In this fast-changing world of containers and microservices itвЂ™s comforting that some things donвЂ™t change, such as setting up a Linux email server.

Mdaemon fax server