rfc977.txt NNTP
rfc1939.txt POP3
-rfc2015.txt MIME Security with Pretty Good Privacy (PGP)
rfc2045.txt MIME 1
rfc2046.txt MIME 2
rfc2047.txt MIME 3
rfc2821.txt SMTP
rfc2822.txt Internet Message Format
rfc2980.txt Common NNTP Extensions
+rfc3156.txt MIME Security with OpenPGP