Hello, we currently host multiple email domains. We currently ues a pop based email server but are looking to go to exchange 2007. Our problem is that when a client emails us we don't know what domain they sent to. Outlook and thunderbird defualt to the primary email domain. EG our primary email domain is ABC.COM if a client sends an email to tom@QQQ.COM we receive the email but when we look at it itis addressed to tom@abc.com, so we don't know what email to reply from. Since we have multiple store fronts this is a huge dilema and has to be resolved or we can't go forward with exchange 2007. We are not sure if we need to change a setting in exchange or outlook. Any assistance is greatly appreciated. Jessie Gill