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
13 rfc2683.txt IMAP4 Implementation Recommendations
15 rfc2822.txt Internet Message Format
16 rfc2980.txt Common NNTP Extensions
17 rfc3156.txt MIME Security with OpenPGP
18 rfc3501.txt INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1
19 rfc5804.txt A Protocol for Remotely Managing Sieve Scripts