rfc2049.txt MIME 5
rfc2060.txt IMAP4
rfc2183.txt The Content-Disposition Header Field
+rfc2342.txt IMAP4 Namespace
+rfc2359.txt IMAP4 UIDPLUS extension
rfc2487.txt SMTP Service Extension for Secure SMTP over TLS
rfc2821.txt SMTP
rfc2822.txt Internet Message Format
rfc2980.txt Common NNTP Extensions
-rfc2342.txt IMAP4 Namespace
-rfc2359.txt IMAP4 UIDPLUS extension