Not able to connect to mail server using POP3

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I have a mail server and trying to connect to it using pop3 from console application.
but getting exception .. no Such host found.
when i Hit the mail server url manually and login , i am able to login successfully.
please advice.

What I have tried:

using (Pop3 pop3 = new Pop3())
           {
               try
               {
                   pop3.Connect("mail.cloud.xyz.com");  // or ConnectSSL for SSL
                   pop3.UseBestLogin("mailadmin@cloud.xyz.com", "XYZ");
               }
               catch (Exception ex)
               {
                   var mss = ex;
               }// or

           }

Posted 15-Apr-18 23:39pm

ashu1810

Updated 16-Apr-18 0:00am

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F-ES Sitecore 16-Apr-18 5:43am

The error is pretty clear, there is probably some network issue preventing the server from resolving the host name. Contact whoever administers the IIS server, or see if using the IP address rather than the host name works.

ashu1810 16-Apr-18 6:27am

Thank you for the reply.. I tried with IP address too but its not working.

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Jochen Arndt · Answer 1 · 2018-04-16T00:01:00

Solution 1

"No such host found" means that the server name could not be resolved (the corresponding IP address could not be determined) by any of the name lookup methods (DNS, hosts file).

The most common reason is a typo. So check your server name or use copy & paste. To check name resolving you can open a command prompt window and use

nslookup mail.cloud.xyz.com

If it still does not work it might be a problem of the used library. If that is the commercial LimiLabs library (which seems to be case according to the posted code), you might ask at their forum: Limilabs Q&A[^].

Posted 16-Apr-18 0:01am

Jochen Arndt

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ashu1810 16-Apr-18 6:32am

Thank you for reply.. checked with the command prompt,able to see the server details. I think its the problem with the Limilabs library.

Jochen Arndt 16-Apr-18 6:56am

That is the drawback of such closed source libraries: You can't check what is does.

I did not even found a documentation about the provided methods with a quick web research. If there is an overload for the Connect() method accepting an IP address (as string or IPAddress class), you can try that using the address from the nslookup output.