Install sendmail-cf by entering the following commands in the terminal:
sudo apt update sudo apt install sendmail-cf
Description:
powerful, efficient, and scalable Mail Transport Agent (config macros)
Sendmail is an alternative Mail Transport Agent (MTA) for Debian. It is suitable for handling sophisticated mail configurations, although this means that its configuration can also be complex. . This package contains the .m4 (configuration files) for the sendmail packages.
Homepage: http://www.sendmail.org
Version: 8.15.2-10
Section: universe/mail