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| | RFC 1651 (rfc1651) |
 | | Klensin, Freed, Rose, Stefferud & Crocker [Page 2] RFC 1651 SMTP Service Extensions July 1994 4. |
 | | Responses from servers without extensions A server SMTP that conforms to RFC 821 but does not support the extensions specified here will not recognize the EHLO command and will consequently return code 500, as specified in RFC 821. |
 | | Klensin, Freed, Rose, Stefferud & Crocker [Page 9] RFC 1651 SMTP Service Extensions July 1994 [3] Borenstein, N., and N. Freed, "Multipurpose Internet Mail Extensions", RFC 1521, Bellcore, Innosoft, September 1993. |
| www.cse.ohio-state.edu /cgi-bin/rfc/rfc1651.html (2175 words) |
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