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I am working on a Windows 2008 R2 server running Exchange 2010 and I am currently trying to troubleshoot a POP3 connectivity issue that is preventing some outside remote accounts from logging into the mail server. The certificates are valid and I have verified from ExchangeShell. I have also the correct Exchange cert CN as the x509 certificate name. As well as verified the POP3 service is running also from ExchangeShell.

I cannot get a POP3 OK from a telnet session via running telnet localhost 110.

The only thing I am returned is:

220 <localhost> Microsoft ESMTP MAIL Service ready at <date> -0500

Any ideas?

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  • Why are you using POP instead of Outlook Anywhere?
    – joeqwerty
    Nov 15, 2016 at 18:49
  • This client uses a programmatic mail receiver that connects to exchange accounts to process emails and extract attachments accordingly.
    – brndng
    Nov 15, 2016 at 18:55
  • If you got 220 <localhost> Microsoft ESMTP MAIL Service ready at <date> -0500 It looks like if you are using the SMTP service on port 110. If you read the following link here the correct response on port 110 should be: OK Microsoft Exchange Server 2010 POP3 service ready So please follow this howto here to make sure you do not use port 110 as SMTP port.
    – BastianW
    Nov 15, 2016 at 18:57
  • Thanks for your input. Its odd because I get that response on both 110 and 995. I will look into that link. I appreciate the assistance.
    – brndng
    Nov 15, 2016 at 19:48
  • @brndng if you login into your Exchange server via RDP and try a telnet localhost 110 did you get the same ESMTP response? Then it look like its a wrong port configuration.
    – BastianW
    Nov 15, 2016 at 20:20

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