What command, utility,or website can I use to see if the ports necessary for Exchange server communication are open on my company's firewall?

What command, utility, or website can I use to see if the ports necessary for Exchange server communication are open on my company's firewall?

I would like to be able to go to another company's network and then run the necessary command, utility, or go to the necessary website to see if the correct Exchange server 2010 communication ports are open on my company's firewall.

How can I do this?

Please provide me with the exact steps.
IT GuyNetwork EngineerAsked:
Who is Participating?
 
Ashok DewanFreelancerCommented:
Very easly , If you want to see, Is your exchange server port is working or not ? then you should check below link :-
http://www.t1shopper.com/tools/port-scan/
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Simon Butler (Sembee)ConsultantCommented:
Microsoft have a site for testing Exchange servers.
http://exrca.com/ 

That is also linked from within the Exchange 2010 toolbox.

Simon.
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