Install elpa-notmuch by entering the following commands in the terminal:
sudo apt update sudo apt install elpa-notmuch
Description:
thread-based email index, search and tagging (emacs interface)
Notmuch is a system for indexing, searching, reading, and tagging large collections of email messages in maildir or mh format. It uses the Xapian library to provide fast, full-text search with a very convenient search syntax. . This package provides an emacs based mail user agent based on notmuch.
Homepage: https://notmuchmail.org/
Version: 0.26-1ubuntu3
Section: universe/mail