A collection of some testing services:

For checking of virus filters you can download here the EICAR test virus which does nothing other than causing an alarm in your virus scanner as long as that scanner recognizes the EICAR virus (which all products do that I know about). Try to download the EICAR test virus.

Traceroute:

Mail mirror: mirror@snake.de
sends you a copy of your email with full quoted headers back to your From or Reply-To address (as long as it's valid of course).

Test-Download of a PDF File.