Port is filtered out

Peter_1985 2,356 Reputation points

I've already enabled Firewall rules on 587 port but Namecheap.com still update me that 587 port is filtered below. How to ensure that 587 port is not filtered out?


Windows Network
Windows Network
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Network: A group of devices that communicate either wirelessly or via a physical connection.
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  1. Gloria Gu 3,886 Reputation points


    Thank you for posting in Q&A!

    Port 587 is the default mail submission port that supports all types of SMTP data transmission. May I ask port 587 is used for which function in your environmen? Please make sure the application using 587 is running in your server.

    What's more, can you please provide the screenshoot of the windows firewall rule allowing 587?

    Usually, we use telnet in windows to test whether a port is blocked or not. Firstly, we should Enable telnet client in Microsoft Windows operating system. For more details, please refer to:

    Hope you have a nice day : )


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  2. Peter_1985 2,356 Reputation points

    Please see my 587 rule below

  3. Peter_1985 2,356 Reputation points

    Here is what I've got when I am to telnet the domain on port 587.


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