Install sensible-mda by entering the following commands in the terminal:
sudo apt update sudo apt install sensible-mda
Description:
Mail Delivery Agent wrapper
Sensible-mda is a Debian addition in the sendmail package and has been split out in hopes that it might be useful for other MTA packages. . Sensible-mda is called by the MTA, and will in turn call whichever of the following MDAs that it finds (in this order): procmail, maildrop, deliver, mail.local
Homepage: http://www.sendmail.org
Version: 8.15.2-10
Section: universe/mail