More features of e-mail
Last Update 2001-09-16
ESMTP is Extended SMTP (Simple Mail Transfer Protocol).
Here are some RFCs which are of interest for me.
MIME (Multipurpose Internet Mail Extensions)
is a standard to send stuff other than 7Bit ASCII by e-mail.
SMTP Service Extension for Authentication
which is based on
as defined in
- RFC 1985
describes the new
which is a safer version of the old
to start sending messages to rarely connected hosts.
G. Vaudreuil: Enhanced Mail System Status Codes (15 pages)
describes more detailed error/warning return codes for an MTA.
K. Moore: An Extensible Message Format for Delivery Status Notifications
BTW: please don't use
as an authentication mechanism,
unless a strong encryption layer, such as
SSL or TLS,
6. PLAIN SASL mechanism
Clear-text passwords are simple, interoperate with almost all
existing operating system authentication databases, and are useful
for a smooth transition to a more secure password-based
authentication mechanism. The drawback is that they are unacceptable
for use over an unencrypted network connection.
can be used to authenticate clients and servers
and to encrypt e-mail when ESMTP is used.
Please send comments to:
<ca at sendmail.org>
Disclaimer: the information provided may be inaccurate or outdated
if you find an error.