My connection is refused by the POP3/IMAP server.

My connection is refused by the POP3/IMAP server.

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The issue might be caused by either port 110 (POP3) or port 143 (IMAP) being blocked on your network. Depending on your operating system, there are different ways to check whether one of those ports has been blocked on your network. In order to resolve the issue, please follow the steps below:

  • Using Windows:

Please note that telnet command is disabled by default. You should enable it via Start Menu > Programs > Turn Windows features on or off and enable Telnet Client via Windows features. Go to Start Menu >Run. A small window should pop-up. Type “cmd” (without the quotes) in that window and hit Enter.   This will open a console window, type (or paste) the following command in that window and hit Enter once again:

telnet example.com 110          -for POP3

telnet example.com 143          -for IMAP

  • Using Mac:

Go to Mac HD >Applications >Utilities. A console window should pop up. Type (or paste) the following command in that window and hit Enter:

telnet example.com 110          -for POP3

telnet example.com 143          -for IMAP

  • Using Linux:

Open a console or terminal emulator and type the following command:

telnet example.com 110          -for POP3

telnet example.com 143          -for IMAP

If the test has been successful you should receive one of the following results:

for POP3

+OK AVG POP3 Proxy Server 9.0.845/9.0.925 [271.1.1/4161]

for IMAP

* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.

If instead of the above messages you receive one, informing you that the connection was refused, kindly check your firewall settings or contact your local ISP as the port is most likely blocked by them.

Christian Smith Answered on September 28, 2015.
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