1. RFC821
    J.B. Postel: Simple Mail Transfer Protocol, August 1982
  2. RFC822
    D.H. Crocker: Standard for the Format of ARPA Internet Text Messages, August 1982
  3. RFC1123
    R. Braden: Requirements for Internet Hosts -- Application and Support, October 1989
  4. RFC1321
    R. Rivest: The MD5 Message-Digest Algorithm, April 1992
  5. RFC1734
    J. Myers: POP3 AUTHentication command, December 1994
  6. RFC1738
    T. Berners-Lee, L. Masinter, M. McCahill: Uniform Resource Locators (URL), December 1994
  7. RFC1869
    J. Klensin, N. Freed, M. Rose, E. Stefferud, D. Crocker: SMTP Service Extensions, November 1995
  8. RFC1891
    K. Moore: SMTP Service Extension for Delivery Status Notifications, January 1996
  9. RFC1939
    J. Myers, M. Rose: Post Office Protocol - Version 3, May 1996
  10. RFC1951
    P. Deutsch: DEFLATE Compressed Data Format Specification - Version 1.3, May 1996
  11. RFC1952
    P. Deutsch: GZIP file format specification - Version 4.3, May 1996
  12. RFC1957
    R. Nelson: Some Observations on Implementations of Post Office Protocol (POP3), June 1996
  13. RFC2015
    M. Elkins: MIME Security with Pretty Good Privacy (PGP), October 1996
  14. RFC2045
    N. Freed, N. Borenstein: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies, November 1996
  15. RFC2046
    N. Freed, N. Borenstein: Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types, November 1996
  16. RFC2047
    K. Moore: Multipurpose Internet Mail Extensions (MIME) Part Three: Message Header Extensions for Non-ASCII Text, November 1996
  17. RFC2048
    N. Freed, J. Klensin, J.B. Postel: Multipurpose Internet Mail Extensions (MIME) Part Four: MIME Registration Procedures, November 1996
  18. RFC2049
    N. Freed, N. Borenstein: Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples, November 1996
  19. RFC2104
    H. Krawczyk, M. Bellare, R. Canetti: HMAC: Keyed-Hashing for Message Authentication, February 1997
  20. RFC2152
    M. Davis, D. Goldsmith: UTF-7, a Mail-Save Transformation Format of Unicode, May 1997
  21. RFC2183
    S. Dorner, K. Moore, R. Troost: Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field, August 1997
  22. RFC2195
    J. Klensin, R. Catoe, P. Krumviede: IMAP/POP AUTHorize Extension for Simple Challenge/Response, September 1997
  23. RFC2222
    J. Myers: Simple Authentication and Security Layer (SASL), October 1997
  24. RFC2231
    N. Freed, K. Moore: MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations, November 1997
  25. RFC2277
    H. Alvestrand: IETF Policy on Character Sets and Languages, January 1998
  26. RFC2279
    F. Yergeau: UTF-8, transformations format of Unicode and ISO 10646, January 1998
  27. RFC2368
    P. Hoffman, L. Masinter, J. Zawinski: The mailto URL scheme, July 1998
  28. RFC2425
    F. Dawson, T. Howes, M. Smith: A MIME Content-Type for Directory Information, September 1998
  29. RFC2426
    F. Dawson, T. Howes: vCard MIME Directory Profile, September 1998
  30. RFC2449
    R. Gellens, C. Newman, L. Lundblade: POP3 Extension Mechanism, November 1998
  31. RFC2476
    R. Gellens, J. Klensin: Message Submission, December 1998
  32. RFC2554
    J. Myers: SMTP Service Extension for Authentication, March 1999
  33. RFC2595
    C. Newman: Using TLS with IMAP, POP3 and ACAP, June 1999
  34. RFC2646
    R. Gellens: The Text/Plain Format Parameter, August 1999
  35. RFC2821
    J. Klensin: Simple Mail Transfer Protocol, April 2001
  36. RFC2831
    P. Leach, C. Newman: Using Digest Authentication as a SASL Mechanism, May 2001
  37. RFC3030
    G. Vaudreuil: SMTP Service Extensions for Transmission of Large and Binary MIME Messages, December 2001
  38. RFC3207
    P. Hoffman: SMTP Service Extension for Secure SMTP over Transport Layer Security, February 2002
  39. RFC3447
    J. Jonsson, B. Kaliski: Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography, Specifications Version 2.1, February 2003