amavisd-new-postfix software package provides part of Ubuntu mail stack provided by Ubuntu server team, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install amavisd-new-postfix
amavisd-new-postfix is installed in your system.
Make ensure the amavisd-new-postfix package were installed using the commands given below,
$ sudo dpkg-query -l | grep amavisd-new-postfix *
You will get with amavisd-new-postfix package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | |
| Package | amavisd-new-postfix |
| Version | 1:2.7.1-2ubuntu3 |
| Description | part of Ubuntu mail stack provided by Ubuntu server team |
| Sub Section |