We have a mail server for our students that allows them webmail access using Squirrelmail. Our student email addresses are in the form of [email protected]. We have appropriate DNS records for mail to get to the server, but due to some network constraints, we had to create an additional DNS name for the webmail access. The off campus address for this access is squirrelmail.kcai.edu. When students log in from off campus and send mail through Squirrelmail, their messages appear to be coming from squirrelmail.kcai.edu. For example a message sent from off campus would appear as [email protected] instead of [email protected]. In the Mail configuration under Server Manager on the OSX server, the server name is specified as students.kcai.edu. Why is the domain portion of their addresses getting rewritten to match the external DNS name that they used to access the Squirrelmail page? Shouldn't the server sent mail from it's configured hostname? If anyone has any advice, resources, tips, tricks or answers, I'd love to hear them. Thanks in advance. Rob