I have managed to install a mail service on my server (Windows Server 2008 R2 with IIS 7). Currently it can be accessed through https://mail.mydomain.info:8000. I would like to access it without specifying the port no e.g. https://mail.mydomain.info. Can anyone direct me what kind of configuration I should set up (in the IIS or DNS or elsewhere) ?
Since the default port of HTTPS is 443, you should configurate your web mail service to listen port 443 with SSL in IIS 7. You can follow this guide to change port in IIS 7.