RFC defined ESMTP Status Error Codes. The first number generally tells whether the server accepted the command and if it could manage it. - Page 1/3

New enhanced ESMTP Status/Error Codes and descriptions defined by RFC Protocol - Page 2/3

Request for Comment (RFC)
in .txt file format for downloading - This Page 3/3

Definition of extension to the SMTP service RFC-821

Winsock Error Codes

Mail Object Error Message

Request For Comment (RFC)
A document outlining a standard and proposed standard to an existing standard. The protocols and standards that currently govern RFC are constantly changing and not limited to the following examples.

rfc 821 for the basic specification of SMTP in .txt format, file size 120 KB - to download it click here

RFC 1939 Post Office Protocol – Version 3
to download the file in text format click here
Version 3 is a standard internet protocol used for retrieving Internet email. It is used by your email client i.e. Eudora, Netscape Communicator, MS Outlook, etc., to communicate with SMTP mail servers.

rfc1123 for important additional information.
http://sunsite.org.uk/rfc/rfc1123.txt

For information about enhanced status codes.
rfc1893   http://sunsite.org.uk/rfc/rfc1893.txt
rfc2034   http://sunsite.org.uk/rfc/rfc2034.txt

RFC index for further mail-related RFCs
http://sunsite.org.uk/rfc/rfc-index.txt

rfc2821 for the basic specification of SMTP
http://sunsite.org.uk/rfc/rfc2821.txt

RFC 821 Simple Mail Transfer Protocol (SMTP)
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc0821.txt

RFC 822 Standard for the format of ARPA Internet text messages
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc0822.txt

RFC 1123 Internet Host Requirements
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1123.txt

RFC 1854 SMTP Service Extension for Command Pipelining
RFC 1869 SMTP Service Extensions (ESMTP)
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1869.txt

RFC 1891 SMTP Service Extension for Delivery Status Notifications
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1891.txt

RFC 1892 Multipart/Report
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc0821.txt

RFC 1893 Mail System Status Codes (about enhanced status codes) www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1893.txt

RFC 1894 Delivery Status Notifications
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1894.txt

RFC 2045 MIME Part One: Format of Internet Message Bodies

RFC 1985 SMTP Service Extension for Remote Message Queue Starting  www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc1985.txt

RFC 2034 SMTP Service Extension for Returning Enhanced Error Codes www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc2034.txt

RFC 2045 MIME
www.urz.uni-heidelberg.de/Netzdienste/Mail/rfc/rfc2045.txt

RFC 2046 MIME Part Two: Media Types
RFC 1047 MIME Part Three: Message Header Extensions for
               Non-ASCII Text

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