I am new to Zimbra so I apologize if this an obvious problem. Never-the-less I appreciate any help you can provide.
Our email is hosted at a third party, justhost.com. Our ISP does not provide email relay services. Therefore, I am stuck with Zimbra sending email to the third party to relay. The third party requires authentication using the account from which the email is being sent. Currently Zimbra sends the messages as email@example.com instead of as firstname.lastname@example.org. Is there an easy way to have Zimbra send the email messages from the public domain instead of the internal domain?