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My ISP is blocking SMTP port 25. What should I do?

If you find out that your local ISP is blocking port 25, you need to contact them to find out the opened SMTP port. Usually, they open an alternative port 587, but this is something you need to check with them directly. Once you have confirmed it, please raise a ticket via our Help Desk System and our Support Team will open an alternative SMTP port for you.


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