Install claws-mail-attach-remover by entering the following commands in the terminal:
sudo apt update sudo apt install claws-mail-attach-remover
Mail attachment remover for Claws Mail
This plugin for the Claws Mail mailer provides ways to remove unwanted attachments from received mails. . All attachments are removed from the selected mails when more than one message is selected. . You can also remove individual attachments from messages.