If you inject a stub for qmail there is no reason why ssmtp should be blocked too. Stubs are only good for the package which you specified and no others.However, my understanding is that ssmtp would not be installed if qmail was actually there, as it would satisfy the virtual/mta dependency. Therefore, if the system thinks that qmail is installed, then ssmtp would not be installed.
Perhaps doing the inject is only satisfying qmail and NOT injecting/satisfying virtual/mta...
If inject doesn't actual parse the qmail ebuild it may not "realize" that it needs to satisfy that virtual.
Matt
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