What is “notmuch” Package?

Thread-based email index, search, and tagging
For more details: https://notmuchmail.org

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install notmuch.

  brew install notmuch

Now, use notmuch!