Install sendmail-base by entering the following commands in the terminal:
sudo apt update sudo apt install sendmail-base
Description:
powerful, efficient, and scalable Mail Transport Agent (arch independent files)
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 base, architecture independent, portions of the sendmail packages.
Homepage: http://www.sendmail.org
Version: 8.15.2-10
Section: universe/mail