i have been trying to configure same doamin (@example.com) in Exchange and Linux.And some users in Linux and some users in Exchange 2003.Thanks in advanceprabhu

Here are couple of articles to share smtp address space (@example.com) step by step in Exchange 2003... Exchange 2003 SMTP Namespace Sharing http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html How to share an SMTP address space in Exchange 2000 Server or in Exchange Server 2003 http://support.microsoft.com/kb/321721 Amit Tank | MVP Exchange Server | MCITP: EMA, MCSA: M | http://ExchangeShare.WordPress.com

Thanks Amit