8 rfc2183.txt The Content-Disposition Header Field
9 rfc2342.txt IMAP4 Namespace
10 rfc2359.txt IMAP4 UIDPLUS extension
11 rfc2487.txt SMTP Service Extension for Secure SMTP over TLS
12 rfc2554.txt SMTP Service Extension for Authentication
14 rfc2822.txt Internet Message Format
15 rfc2980.txt Common NNTP Extensions
16 rfc3156.txt MIME Security with OpenPGP
17 rfc3501.txt INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1