claws-mail-smime-plugin software package provides S/MIME signature/encryption handling for Claws Mail, you can install in your Ubuntu 16.10 (Yakkety Yak) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install claws-mail-smime-plugin
claws-mail-smime-plugin is installed in your system.
Make ensure the claws-mail-smime-plugin package were installed using the commands given below,
$ sudo dpkg-query -l | grep claws-mail-smime-plugin *
You will get with claws-mail-smime-plugin package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | |
| Package | claws-mail-smime-plugin |
| Version | 3.14.0-1ubuntu1 |
| Description | S/MIME signature/encryption handling for Claws Mail |
| Sub Section |