Our default theme for e-mail notifications includes XTRF signs and "Powered by XTRF" pictures. So, all e-mails that go out from the system contain them.
The way to reduce the XTRF branding in all outgoing e-mails is to go to Templates > Notifications > Themes in the system configuration and edit it to your liking.
If you want to replace XTRF graphics with your own, pictures need to be uploaded in the E-mail Images tab. Click the Preview button at the bottom of the screen to see how your changes will look after they are saved.
Customer support service by UserEcho