NUMBER DESCRIPTION
-----------------------------------------------------------
-RFC 1730 IMAP version 4
-RFC 2060 IMAP version 4rev1
+RFC 822 Format of ARPA Internet text messages
+RFC 1730 IMAP version 4 (obsoleted by 2060)
+RFC 2045 MIME Part One: Format of Internet Message Bodies
+RFC 2046 MIME Part Two: Media Types
+RFC 2047 MIME Part Three: Message Header Extensions for Non-ASCII Text
+RFC 2060 IMAP version 4rev1 (obsoleted by 3501)
RFC 2183 Content-Disposition MIME header
RFC 2195 IMAP/POP AUTHorize Extension for Simple Challenge/Response
RFC 2221 IMAP4 Login Referrals
RFC 2683 IMAP4 Implementation Recommendations
RFC 2822 Format of an email message (sendmail)
RFC 2831 Using Digest Authentication as a SASL Mechanism (digest-md5)
+RFC 3501 IMAP version 4rev1