.H- "Requests for Comments
.P
RFCs document the Internet. They are published by the
.I "Internet Engineering Task Force
(IETF).
Any particular RFC is located at:
.VS
http://www.ietf.org/rfc/rfcNNNN.txt
VE
The placeholder `\fLNNNN\fP' needs to be replaced with the four-digit
number of the RFC.
RFC\|821, for example, can be found at
.Fn http://www.ietf.org/rfc/rfc0821.txt .
.P
The following list of contains all RFCs referenced in this document.
.sp

.IP RFC\|821
.I "Simple Mail Transfer Protocol",
August 1982.

.IP RFC\|822
.I "Standard for the Format of ARPA Internet Text Messages",
August 1982.

.IP RFC\|1864
.I "The Content-MD5 Header Field",
October 1995.

.IP RFC\|2045
.I "Multipurpose Internet Mail Extensions (MIME) Part One: \
	Format of Internet Message Bodies" ,
November 1996.

.IP RFC\|2046
.I "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types" ,
November 1996.

.IP RFC\|2047
.I "MIME (Multipurpose Internet Mail Extensions) Part Three: \
	Message Header Extensions for Non-ASCII Text" ,
November 1996.

.IP RFC\|2048
.I "Multipurpose Internet Mail Extensions (MIME) Part Four: \
	Registration Procedures" ,
November 1996.

.IP RFC\|2049
.I "Multipurpose Internet Mail Extensions (MIME) Part Five: \
	Conformance Criteria and Examples" ,
November 1996.

.IP RFC\|2822
.I "Internet Message Format",
April 2001.

.IP RFC\|3156
.I "MIME Security with OpenPGP",
August 2001.

.IP RFC\|4880
.I "OpenPGP Message Format",
November 2007.