couriergrey software package provides Mail filter interface of Courier-MTA to support greylisting, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install couriergrey
couriergrey is installed in your system.
Make ensure the couriergrey package were installed using the commands given below,
$ sudo dpkg-query -l | grep couriergrey *
You will get with couriergrey package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | |
| Package | couriergrey |
| Version | 0.3.2-1 |
| Description | Mail filter interface of Courier-MTA to support greylisting |
| Sub Section |