#2904: recursive pgp_check_traditional() will crash on complicated multipart messages
pgp_check_traditional() is implemented recursively, so deeply nested multipart messages will cause a stack overflow, which can be annoying on systems with limited stack space. Reproduce: $ bash mime.sh > crash $ mutt -F /dev/null -f crash -e 'set pgp_auto_decode' Segmentation fault -- Ticket URL: <http://dev.mutt.org/trac/ticket/2904>
