== How do I run Mailman on a server with an external MTA? ==

Using an external MTA for outgoing mail from Mailman is fairly straightforward.

There are configuration settings for SMTPHOST and SMTPPORT to specify where to connect to send mail and beginning with 2.1.23 there are settings SMTP_AUTH, SMTP_USER, SMTP_PASSWD and SMTP_USE_TLS to provide authentication and use TLS with the external MTA.

Getting mail from the external MTA to Mailman is more complex.

[[DOC/4.88 How to run Mailman as a relay - using fetchmail to deliver from an ISP to Mailman.|This article]] describes a method using fetchmail, and [[https://blog.jcea.es/posts/20161126-mailman.html|this blog post]] by Jesus Cea describes another setup in detail.