A nice blurb on the Encrypted SMTP connections using TLS/SSL on Exim4 website:
For TLS version 1.3 the control available is less fine-grained and Exim does not provide access to it at present. The value of the tls_require_ciphers option is ignored when …
Google offers you johnd+XXXX@gmail.com; Yahoo provides johnd+XXXX@yahoo.com; Why not you and your Exim4 mail server? This guide will help deploy the email subaddressing feature for local_part of your email address.
Details the many ways that one can set up the Exim4 Mail Server for Debian.
What does Exim4 read for configuration files in Debian Split-Configuration mode? Debian Standalone mode? Exim4 mode?
Your Exim4 mail server is rejecting the “RCPT TO:”.
A quick guide on how to use the swaks SMTP exercising tool.
Why is the Exim4 configuration file have a strange filetype of .conf.conf?
How to debug Exim4 daemon.
Comparison of MTAs with regard to Local Part of Email Address