Many time we need to know which all ports are open on our server and which are closed.
Open ports are needed for usually using smtp, pop, imap, ftp services.
Usually people encounter error using email scripts because the pop or smtp ports like 995, 993, 465 are sometimes closed by the web hosting company.
We can check which all ports are open by using a simple tool developed by You Get Signal.
Just go to the site and enter the domain and port number and it will give you the status. http://www.yougetsignal.com/tools/open-ports/
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