Flameeyes has pointed out that the stunnel binary is not found by app-emacs/vm in its standard configuration. The reason is that stunnel is currently installed in /usr/sbin which is not in the PATH for normal users. It should go to /usr/bin. See also the thread associated with <http://mirt.net/pipermail/stunnel-users/2007-September/001645.html>. Please note that Debian and Cygwin have already moved it, and upstream will also have it in /usr/bin for the 4.21 release, see <http://stunnel.mirt.net/ChangeLog_sdf.html>.
Just fix this yourself, ramereth doesn't maintain this at all, despite being in metadata.xml.
*** This bug has been marked as a duplicate of bug 197881 ***