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Why is the POP3/IMAP server refusing my connection attempts?

Last update: Sep 02, 2025

The standard server ports used for POP3 and IMAP protocols are 110 and 143, respectively. For a secure connection over SSL/TLS, the ports are 995 for POP3 and 993 for IMAP.


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If your connection attempts are refused by the POP3 or IMAP server, the most probable cause is a block on the IMAP/POP3 port you are using.

Test the connectivity to your mail server on that specific port by using Telnet. To do so, follow the steps in this article.

Want to learn more about email and SMTP troubleshooting? Download our comprehensive ebook – it is all that you need to solve similar errors with ease!

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