Ben, I believe what you're seeing here is a byproduct of SRS (Sender Rewrite Scheme) adjusting the from address to account for the forwarding it has undergone:
Do you have SRS enabled under Settings>Antispam>Options? The toggle you're looking for here is the Enable SRS when forwarding messages setting. More information about this setting from our help is found here:
- Enable SRS when forwarding messages - Enable this to allow the mail server to re-email (as opposed to "forward") an email message so that it passes any SPF checks on the recipient's end.
Kyle Kerst
IT Coordinator
SmarterTools Inc.
www.smartertools.com