Install claws-mail-libravatar by entering the following commands in the terminal:
sudo apt update sudo apt install claws-mail-libravatar
Display sender avatar from a libravatar server
This plugin for the Claws Mail mailer allows retrieval of profile images from libravatar servers, either federated servers (running on sender's domain) or the main libravatar.org server. . Currently supports all default missing icon modes on libravatar.org service, and makes extensive use of disk caching to minimize the number of network requests. . Nevertheless, it may add several network requests per message, so if you're on a high latency network you may experience some delay displaying messages.