External Evaluation Tools

The world of servers isn't getting clearer, but even more condensed every day. The following websites should serve you in order to give you an overview of the level of security of your services

XMPP

https://xmpp.net/ - You can choose between client-to-server / server-to-server

SSL

https://www.ssllabs.com/ssltest/

MX Records

http://mxtoolbox.com/SuperTool.aspx