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smtp(n)                                          smtp client                                         smtp(n)



____________________________________________________________________________________________________________

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...

____________________________________________________________________________________________________________

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 process-ing. processing.
                     ing. A boolean value.

              -atleastone
                     Indicates that the SMTP server must find at least one recipient acceptable for the mes-sage message
                     sage 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 pack-age package
                     age 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  set-up. setup.
                     up.  The command is called with the SMTP code and diagnostic message appended. The com-mand command
                     mand should return 'secure' or 'insecure' where insecure will cause the package to con-tinue continue
                     tinue  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 provide your authentication details to the server.
                     Currently this package supports DIGEST-MD5, CRAM-MD5, LOGIN  and  PLAIN  authentication
                     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 chan-nel. channel.
                     nel.

       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 outgo-ing outgoing
       ing 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, containing the address, an SMTP error code, and a textual diag-nostic. diagnostic.
       nostic. 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-edi-
              tor.org/rfc/rfc2821.txt

       [3]    P.  Hoffman, "SMTP Service Extension for Secure SMTP over Transport Layer Security", RFC 3207,
              February 2002.  (http://www.rfc-editor.org/rfc/rfc32_7.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://source -
       forge.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)