drac software package provides Dynamic Relay Authorization Control (pop-before-smtp), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install drac
drac is installed in your system.
Make ensure the drac package were installed using the commands given below,
$ sudo dpkg-query -l | grep drac *
You will get with drac package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | drac |
| Version | 1.12-8build1 |
| Description | Dynamic Relay Authorization Control (pop-before-smtp) |
| Sub Section | Net |
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