claws-mail-extra-plugins software package provides Extra plugins collection for Claws Mail, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install claws-mail-extra-plugins
claws-mail-extra-plugins is installed in your system.
Make ensure the claws-mail-extra-plugins package were installed using the commands given below,
$ sudo dpkg-query -l | grep claws-mail-extra-plugins *
You will get with claws-mail-extra-plugins package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Meta packages |
| Package | claws-mail-extra-plugins |
| Version | 3.14.1-1 |
| Description | Extra plugins collection for Claws Mail |
| Sub Section | Meta packages |