Documentation for the current version of Mailtraq is provided as an online help file included with the program.
In addition, there is much general configuration advice on this website:
There is an Installation Guide to the current version of Mailtraq here ...
The previous version shipped with a manual, which whilst now mainly obsolete does include useful information on email services in general and why things work as they do.
It is available for download here:
Mailtraq 1 Manual (PDF format, 2Mb)
The Mailtraq 1 manual provides much useful background information particularly on mail routing and mailing list management, but it should not be used as a reference for detailed configuration. Although the user-interface is similar, Mailtraq 1 and Mailtraq 2 are very different underneath.
The context Help system within the program gives the definitive guide to configuring Mailtraq.