smtp(n) 							    smtp client 							   smtp(n)

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NAME

       smtp - Client-side tcl implementation of the smtp protocol

SYNOPSIS

       package require Tcl

       package require mime  ?1.5.4?

       package require smtp  ?1.4.5?

       ::smtp::sendmessage token option...

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DESCRIPTION

       The smtp library package provides the client side of the Simple Mail Transfer Protocol (SMTP) (1) (2).

       ::smtp::sendmessage token option...
	      This  command  sends the MIME part (see package mime) represented by token to an SMTP server. options is a list of options and their
	      associated values.  The recognized options are:

	      -servers
		     A list of SMTP servers. The default is localhost.

	      -ports A list of SMTP ports. The default is 25.

	      -client
		     The name to use as our hostname when connecting to the server. By default this is either localhost if one of the  servers	is
		     localhost, or is set to the string returned by info hostname.

	      -queue Indicates that the SMTP server should be asked to queue the message for later processing. A boolean value.

	      -atleastone
		     Indicates that the SMTP server must find at least one recipient acceptable for the message to be sent. A boolean value.

	      -originator
		     A string containing an 822-style address specification. If present the header isn't examined for an originator address.

	      -recipients
		     A	string	containing  one  or  more  822-style  address  specifications.	If present the header isn't examined for recipient
		     addresses). If the string contains more than one address they will be separated by commas.

	      -header
		     A list containing two elements, an smtp header and its associated value (the -header option may occur zero or more times).

	      -usetls
		     This package supports the RFC 3207 TLS extension (3) by default provided the tls package is available. You can turn this  off
		     with this boolean option.

	      -tlspolicy
		     This  option lets you specify a command to be called if an error occurs during TLS setup. The command is called with the SMTP
		     code and diagnostic message appended. The command should return 'secure' or 'insecure' where insecure will cause the  package
		     to  continue  on  the  unencrypted channel.  Returning 'secure' will cause the socket to be closed and the next server in the
		     -servers list to be tried.

	      -username

	      -password
		     If your SMTP server requires authentication (RFC 2554 (4)) before accepting mail you can use -username and -password to  pro-
		     vide your authentication details to the server. Currently this package supports DIGEST-MD5, CRAM-MD5, LOGIN and PLAIN authen-
		     tication methods. The most secure method will be tried first and each method tried in turn until we are either authorized	or
		     we  run  out  of  methods. Note that if the server permits a TLS connection, then the authorization will occur after we begin
		     using the secure channel.

       If the -originator option is not present, the originator address is taken from From (or Resent-From); similarly, if the -recipients  option
       is  not	present, recipient addresses are taken from To, cc, and Bcc (or Resent-To, and so on). Note that the header key/values supplied by
       the -header option (not those present in the MIME part) are consulted. Regardless, header key/values are added to the outgoing  message	as
       necessary to ensure that a valid 822-style message is sent.

       The command returns a list indicating which recipients were unacceptable to the SMTP server. Each element of the list is another list, con-
       taining the address, an SMTP error code, and a textual diagnostic. Depending on the -atleastone option and the intended recipients, a  non-
       empty list may still indicate that the message was accepted by the server.

EXAMPLE

       proc send_simple_message {recipient email_server subject body} {
	   package require smtp
	   package require mime

	   set token [mime::initialize -canonical text/plain \
	    -string $body]
	   mime::setheader $token Subject $subject
	   smtp::sendmessage $token \
	    -recipients $recipient -servers $email_server
	   mime::finalize $token
       }

       send_simple_message someone@somewhere.com localhost \
	   "This is the subject." "This is the message."

REFERENCES

       [1]    Jonathan B. Postel, "SIMPLE MAIL TRANSFER PROTOCOL", RFC 821, August 1982.  (http://www.rfc-editor.org/rfc/rfc821.txt)

       [2]    J. Klensin, "Simple Mail Transfer Protocol", RFC 2821, April 2001.  (http://www.rfc-editor.org/rfc/rfc2821.txt)

       [3]    P.  Hoffman,  "SMTP Service Extension for Secure SMTP over Transport Layer Security", RFC 3207, February 2002.  (http://www.rfc-edi-
	      tor.org/rfc/rfc3207.txt)

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

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category smtp	of
       the  Tcllib  SF	Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

SEE ALSO

       ftp, http, mime, pop3

KEYWORDS

       email, internet, mail, mime, net, rfc 2554, rfc 2821, rfc 3207, rfc 821, rfc 822, smtp, tls

CATEGORY

       Networking

COPYRIGHT

       Copyright (c) 1999-2000 Marshall T. Rose and others

mime								       1.4.5								   smtp(n)