1.2.1 Normative References

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[RFC2034] Freed, N., "SMTP Service Extension for Returning Enhanced Error Codes", RFC 2034, October 1996, http://www.rfc-editor.org/rfc/rfc2034.txt

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt

[RFC2554] Myers, J., "SMTP Service Extension for Authentication", RFC 2554, March, 1999, http://www.rfc-editor.org/rfc/rfc2554.txt

[RFC3030] Vaudreuil, G., "SMTP Service Extensions for Transmission of Large and Binary MIME Messages", RFC 3030, December 2000, http://www.rfc-editor.org/rfc/rfc3030.txt

[RFC4954] Siemborski, R., and Melnikov, A., Eds., "SMTP Service Extension for Authentication", RFC 4954, July 2007, http://www.rfc-editor.org/rfc/rfc4954.txt

[RFC5321] Klensin, J., "Simple Mail Transfer Protocol", RFC 5321, October 2008, http://rfc-editor.org/rfc/rfc5321.txt