Install claws-mail-feeds-reader by entering the following commands in the terminal:
sudo apt update sudo apt install claws-mail-feeds-reader
Feeds (RSS/Atom) reader plugin for Claws Mail
The RSSyl plugin provides feeds reading capability for Claws Mail mailer. . Supported formats are RSS (1.0, 2.0 and probably 0.9x versions) and Atom feeds. . Has also per-feed customization features, transforming Claws Mail into a powerful lightweight feeds reader.