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Useful Links
https://www.testexchangeconnectivity.com - a really useful tool for testing Mail Server connectivity and open relay.
https://www.grc.com/default.htm - ShieldsUP Port Scanner
http://baturin.org/tools/encapcalc/ - MTU Calculator
http://www.libreoffice.org/ - LIBREOFFICE 5: IT STANDS OUT FROM THE OFFICE SUITE CROWD.