Install claws-mail-extra-plugins by entering the following commands in the terminal:
sudo apt update sudo apt install claws-mail-extra-plugins
Extra plugins collection for Claws Mail
This is a metapackage for installing all extra plugins packages available from the upstream site for the Claws Mail mailer. . Historically these were plugins shipped in a separate tarball but nowadays they are included in Claws Mail sources. . See each individual package description for further details.