When using a professional webhotel hosting company, their serveraddress to the incoming e-mails (pop3 / imap) are limited to a specific subdomain.

Example: Port 25 (SMTP) can only be accessed via smtp.domain.com
         Port 143 (IMAP) can only be accessed via mail.domain.com

How to configure this on my Windows Server 2008 R2 machine? Is it through the firewall, or?

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  • If those are external machines, by firewall. If those are alternate names (via DNS), no way to do it. – vonbrand Feb 17 '13 at 12:50

i think they just have different servers for their website (www.domain.com) and mail-servers (mail.domain.com / smtp.domain.com) with corresponding dns-records. in this case, you can only access port 25/143 via smtp.domain.com / mail.domain.com because there is a mailserver waiting for connections on this ports...

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