According to http://enigmail.mozdev.org/, enigmail is released under the MPL _and_ the GPL, whereas the ebuild states it is released under the MPL only. Also, the homepage is said to be http://www.enigmail.mozdev.org/, instead of http://enigmail.mozdev.org/. I know this is no big deal, but I still think it should be corrected.
*** Bug 160341 has been marked as a duplicate of this bug. ***
Fixed, thanks for reporting.
Damn, I actually wanted to close the bug..