It depends how the server and network is setup.
In most cases, domains included are:
- Internal server name.
- Internal server with internal domain name.
- Domains uses for server access through Outlook Web Access or POP/IMAP.
- Domains used in Exchange/Outlook 07.
Examples:
mailserver - Private Server Name
mailserver.local - Internal LAN name
mailserver.mydomain.net - POP / SMTP / IMAP Server
mailserver.domain.com - POP / SMTP / IMAP Server
owa.domain.com - Outlook Web Access
autodiscover.domain.com – AutoDiscover
