Gmail recently changed settings to how a sender's from domain is displayed when viewing an email.  As you can see above, gmail will now default to showing the from email address and the actual sender of the message.  This information was always available, but in the past, the default view only showed a sender's from name.  If you wanted to view more detailed information, you had to click show details.  Read more at the Gmail Help site here.

You'll notice the above email was sent by info@fanmailmarketing via bounce.exacttarget.com.  The display of the sender information is not specific to ExactTarget or FanMail.  If you are a subscriber to other email lists, you will probably notice many of them come via another sender, like the example below.

If controlling the sender information that is seen here is important to your company, drop us a line, and we can tell you how to say hasta la vista to via (email us and we will tell you how to get rid of sender information after via).