DNS Name diferent from server Name

My server host Name is XXXXX and i have an alias name in the DNS that is IM that point to XXXXX server

How I can change the server settings to work like IM server. For example aangel@IM not aangel@XXXXX

is this posible?. The configuration is Windows 2008 R2+ SQL SERVER+ Active Directory Authentication+Pandion client.

Any sugestion?

Sorry my english

Change the xmpp.domain attribute.

Ok i have web aplications and it function very well. But with Pandion i cant logon to the server. Any idea?

Can you provide more specifics? I’m not familiar with what Pandion is.

Pandion is a desktop client.