bley software package provides intelligent greylisting daemon for Postfix, 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 bley
bley is installed in your system.
Make ensure the bley package were installed using the commands given below,
$ sudo dpkg-query -l | grep bley *
You will get with bley package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | |
| Package | bley |
| Version | 0.1.5-2+deb7u1 |
| Description | intelligent greylisting daemon for Postfix |
| Sub Section |