avelsieve software package provides Sieve mail filters plugin for SquirrelMail, you can install in your Ubuntu 12.04 LTS (Precise Pangolin) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install avelsieve
avelsieve is installed in your system.
Make ensure the avelsieve package were installed using the commands given below,
$ sudo dpkg-query -l | grep avelsieve *
You will get with avelsieve package name, version, architecture and description in a table
| Distro | Ubuntu 12 04 lts precise pangolin |
| Section | Web Software |
| Package | avelsieve |
| Version | 1.9.9-2.1 |
| Description | Sieve mail filters plugin for SquirrelMail |
| Sub Section | Web |