Exchange 2003 and I assume Exchange 2007 will allow a single Exchange server to 'host' several email domains but in Exchange 2003 you can only send from one of those domains. Will Exchange 2007 allow a user to send email from one domain when a different user will send fromanother domain? Like: User A is on contoso.com and all their emails need to appear to come from contoso.com and User B is on the same server and is receiving from contosoholdings.com and their email must be sent as if from contosoholdings.com yet functionally they are on the same server and the same company but for corporate political reasons need to appear to be divided per the corporate structure. Currently under Exchange 2003 it appears that everyone's email issent from onedomain, ie: all come from either contoso.com or contosoholdings.com determined by recipient policy on the Exchange server. Is it possible to set the domain BY USER rather than by server? Thanks for any help.

Hi, You need to configure second domain as an accepted domain in Exchange 2007 to receive emails for it. Reference: Configure Exchange 2007 to Receive E-Mail for other Domains http://www.petri.co.il/configure-exchange-2007-recieve-email-other-domains.htm To assign email addresses to the users of second domain in your environment, you need to create an email address policy and set second domain email address as primary so when user sends mail it goes as an smtp address of second domain. References: How to Create an E-Mail Address Policy http://technet.microsoft.com/en-us/library/bb124401(EXCHG.80).aspx Configure Specific E-Mail Addresses for Specific Exchange 2007 Recipients http://www.petri.co.il/configure-specific-email-addresses-exchange-2007-recipients.htm You need to configure the MX record to receive mails for other domain.

Would said user using Domain B for sending email be able to receive emails from Domain A as well as Domain B? Thanks for responding!

Yes, in email address policy keep smtp address of Domain B as primary and smtp address of Domain A secondary so users will be able to receive email for both domains.

Thanks for your assistance. I couldn't find this at the Microsoft Support site no matter how hard I looked.