In v 7.3 and now 8.0, the e-mail address for FogBugz is automatically added to Cc when replying to the correspondent. Thus, the reply is listed 2x in the case history.
For example, don.johnson@mycompany.com reports a bug by sending an e-mail to helpdesk@mycompany.com. A support rep replies from FogBugz (through helpdesk@mycompany.com) but helpdesk@mycompany.com is added to Cc which causes the outgoing e-mail to be sent not only to don.johnson@mycompany.com but also straight into FogBugz, linking it to the case history as both outgoing and incoming e-mail.
I'm not sure how this "feature" is supposed to work but is there a way to turn it off?