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I am new to Windows servers, I have Windows Server 2012 and I am trying to set up and enable mail server (SMTP). I have followed this tutorial to instal and enable SMTP server and completed it successfully. Now I would like to test my server, I installed Telnet and ran this command:

open localhost 25

I get a line that says:

press any key to continue....

and if I do anything I get a message:

connection to host lost.

Question: What could be the most likely cause of this and how to resolve it?

K.I
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1 Answers1

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Incorrect access restriction to the service.

Its the step 6 of your tutorial.

If its setup correctly be sure you have no antivirus that scan/restrict the port 25. It can cause such issue too.

yagmoth555
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    I fixed the issue by setting up port forwarding on my router and using my domain name instead of a localhost. – K.I Jun 14 '16 at 13:16