Install caja-sendto by entering the following commands in the terminal:
sudo apt update sudo apt install caja-sendto
integrates email clients and Pidgin into the Caja file manager
Caja is the official file manager for the MATE desktop. This package adds extended functionality to the Caja file manager. . The Caja Send To extension provides the Caja file manager with a context menu component for quickly sending files to given email addresses, contacts on a Pidgin or Gajim instant messaging list, through Thunderbird/Icedove, or through Claws Mail. . Caja Send To also provides the option of compressing the files (tar.bz2, tar.gz, or zip) before sending.