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This article will show you show to test if your computer can successfully open a connection to our mail servers. It is a useful exercise as it can help to determine if your computer has a general problem connecting to our services, or if the problem lies in a specific email software application you have installed.
Open a CMD (Windows) or Terminal (Mac) window.
Windows users should run the built in CMD.exe program from the Start button. Mac users should start the Terminal app from Applications/Utilities.
Windows Users : It should be noted that the telnet application is not automatically enabled in some editions of Windows, so you will have to enable it first.
To test connectivity
Enter the following command, replacing SERVERNAME either with your domain name, or your Home Server name.
telnet SERVERNAME PORT
Replace PORT with
110 - to test POP3 connectivity 143 - to test IMAP connectivity 25 - to test SMTP connectivity (use port 525 to skip the 20 second connection delay)
Testing POP3 or IMAP
e.g. if your Home Server is hestia.krystal.co.uk and you wish to test POP3 or IMAP connectivity use port 110 or 143 respectively:
telnet hestia.krystal.co.uk 110
You should get a responce that ends with
+OK Dovecot ready.
Just type quit and hit to exit.
If you do not see this after a few seconds, then your computer is unable to connect to our POP3/IMAP service.
e.g. if your Home Server is hestia.krystal.co.uk and you wish to test SMTP connectivity use port 25 or 525. Port 25 will incur a connection delay of around 20 seconds, so use port 525 if you wish.
telnet hestia.krystal.co.uk 25
Escape character is '^]'.
220-hestia.krystal.co.uk ESMTP Exim 4.87 #1 Fri, 15 Jul 2016 10:04:53 +0100
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
If you do not see this after a few seconds, then your computer is unable to connect to our SMTP service.