Section 10. References

10.1.  Normative References
   [1]   Postel, J., "Simple Mail Transfer Protocol", STD 10, RFC 821,
         August 1982.
   [2]   Mockapetris, P., "Domain names - implementation and
   [3]   Braden, R., "Requirements for Internet Hosts - Application and
   [5]   Bradner, S., "Key words for use in RFCs to Indicate Requirement
   [6]   American National Standards Institute (formerly United States
         of America Standards Institute), "USA Code for Information
         Interchange", ANSI X3.4-1968, 1968.
         ANSI X3.4-1968 has been replaced by newer versions with slight
         modifications, but the 1968 version remains definitive for the
         Internet.
   [7]   Crocker, D. and P. Overell, "Augmented BNF for Syntax
   [8]   Hinden, R. and S. Deering, "IP Version 6 Addressing
   [9]   Newman, C., "ESMTP and LMTP Transmission Types Registration",
   [10]  Klensin, J., Freed, N., and K. Moore, "SMTP Service Extension
   [11]  Klyne, G., Nottingham, M., and J. Mogul, "Registration
         Procedures for Message Header Fields", BCP 90, RFC 3864,
         September 2004.
10.2.  Informative References
   [12]  Partridge, C., "Mail routing and the domain system", RFC 974,
         January 1986.
   [13]  Klensin, J., Freed, N., Rose, M., Stefferud, E., and D.
         Crocker, "SMTP Service Extensions", STD 10, RFC 1869,
         November 1995.
   [14]  Klensin, J., "Simple Mail Transfer Protocol", RFC 2821,
         April 2001.
   [15]  Butler, M., Postel, J., Chase, D., Goldberger, J., and J.
         Reynolds, "Post Office Protocol: Version 2", RFC 937,
         February 1985.
   [16]  Myers, J. and M. Rose, "Post Office Protocol - Version 3",
   [17]  Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - VERSION
   [18]  Gellens, R. and J. Klensin, "Message Submission for Mail",
   [19]  Freed, N., "SMTP Service Extension for Command Pipelining",
   [20]  Vaudreuil, G., "SMTP Service Extensions for Transmission of
   [21]  Freed, N. and N. Borenstein, "Multipurpose Internet Mail
         Extensions (MIME) Part One: Format of Internet Message Bodies",
   [22]  Klensin, J., Freed, N., Rose, M., Stefferud, E., and D.
         Crocker, "SMTP Service Extension for 8bit-MIMEtransport",
   [23]  Moore, K., "MIME (Multipurpose Internet Mail Extensions) Part
         Three: Message Header Extensions for Non-ASCII Text", RFC 2047,
         November 1996.
   [24]  Freed, N. and K. Moore, "MIME Parameter Value and Encoded Word
         Extensions: Character Sets, Languages, and Continuations",
   [25]  Vaudreuil, G., "Enhanced Mail System Status Codes", RFC 3463,
         January 2003.
   [26]  Hansen, T. and J. Klensin, "A Registry for SMTP Enhanced Mail
   [27]  Freed, N., "Behavior of and Requirements for Internet
   [28]  Crocker, D., "Standard for the format of ARPA Internet text
   [29]  Wong, M. and W. Schlitt, "Sender Policy Framework (SPF) for
         Authorizing Use of Domains in E-Mail, Version 1", RFC 4408,
         April 2006.
   [30]  Fenton, J., "Analysis of Threats Motivating DomainKeys
   [31]  Allman, E., Callas, J., Delany, M., Libbey, M., Fenton, J., and
         M. Thomas, "DomainKeys Identified Mail (DKIM) Signatures",
   [32]  Moore, K., "Simple Mail Transfer Protocol (SMTP) Service
         Extension for Delivery Status Notifications (DSNs)", RFC 3461,
         January 2003.
   [33]  Moore, K. and G. Vaudreuil, "An Extensible Message Format for
   [34]  Postel, J. and J. Reynolds, "File Transfer Protocol", STD 9,
   [35]  Kille, S., "MIXER (Mime Internet X.400 Enhanced Relay): Mapping
   [36]  De Winter, J., "SMTP Service Extension for Remote Message Queue
   [37]  Hansen, T. and G. Vaudreuil, "Message Disposition
   [38]  Elz, R. and R. Bush, "Clarifications to the DNS Specification",
   [39]  Nakamura, M. and J. Hagino, "SMTP Operational Experience in
   [40]  Partridge, C., "Duplicate messages and SMTP", RFC 1047,
         February 1988.
   [41]  Crispin, M., "Interactive Mail Access Protocol: Version 2",
   [42]  Lambert, M., "PCMAIL: A distributed mail system for personal
   [43]  Galvin, J., Murphy, S., Crocker, S., and N. Freed, "Security
         Multiparts for MIME: Multipart/Signed and Multipart/Encrypted",
   [44]  Callas, J., Donnerhacke, L., Finney, H., Shaw, D., and R.
   [45]  Ramsdell, B., "Secure/Multipurpose Internet Mail Extensions
         (S/MIME) Version 3.1 Message Specification", RFC 3851,
         July 2004.
   [46]  Internet Assigned Number Authority (IANA), "IANA Mail
         Parameters", 2007,
         <http://www.iana.org/assignments/mail-parameters>.
   [47]  Internet Assigned Number Authority (IANA), "Address Literal
         Tags", 2007,
         <http://www.iana.org/assignments/address-literal-tags>.