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Port explanation

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  • Port explanation

    I came across this webpage whilst looking for something about using Exchange with a dynamic IP (which has been resolved thanks to this great forum by the way).


    "My ISP started blocking incoming port 25. It's already blocking outgoing port 25 and I'm handling that. Now it's time to start accepting incoming mail on the submission port, 587. They aren't blocking my incoming port 25. But we went through this process for another guy on our computer, so I figured that this is a good thing for which it will pay to be pro active."

    The writer states that port 25 is already blocked outgoing and they are now stopping receiving port 25. Would I be correct in saying that previous to totally blocking Port 25, it would receive on Port 25 and send out on another port?

    Thanks for reading.