Firefox has no built-in email features. If you are accessing email through Firefox it will be a webmail service, and any features will be part of the webmail service. You need to check with the support for the email service that you are using. If your question is about Thunderbird, this forum is just for Firefox support. You can ask Thunderbird questions in either of the following forums: * http://getsatisfaction.com/mozilla_messaging * http://forums.mozillazine.org/viewforum.php?f=39