How to check if a port is blocked by my ISP?
Depending on the operating system of your computer there are different ways to check if a certain port is being blocked by your Internet service provider. We will use port 25 in the examples below, however, the same commands are applicable for any other ports such as 21, 110, 143, 587, etc. Check port 25 in Windows You need to access your Command Prompt. To do so click on the Start menu...
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