Sieve Working Group B. Leiba
Internet-Draft IBM T.J. Watson Research Center
Expires: June 10, 2006 M. Haardt
freenet.de AG
December 7, 2005
Sieve Notification Mechanism: mailto
draft-ietf-sieve-notify-mailto-00
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Copyright (C) The Internet Society (2005).
Abstract
This document describes a profile of the Sieve extension for
notifications, to allow notifications to be sent by electronic mail.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions used in this document . . . . . . . . . . . . . . 3
2. Definition . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Notify tag ":method" . . . . . . . . . . . . . . . . . . . . . 4
2.2 Notify tag ":id" . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Notify tag ":priority" . . . . . . . . . . . . . . . . . . . . 4
2.4 Notify tag ":message" . . . . . . . . . . . . . . . . . . . . 4
2.5 Other Definitions . . . . . . . . . . . . . . . . . . . . . . 5
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4. Internationalization Considerations . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1 Normative References . . . . . . . . . . . . . . . . . . . . . 11
7.2 Non-Normative References . . . . . . . . . . . . . . . . . . . 11
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 11
Intellectual Property and Copyright Statements . . . . . . . . 13
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1. Introduction
1.1 Overview
The [Notify] extension to the [Sieve] mail filtering language is a
framework for providing notifications by employing URIs to specify
the notification mechanism. This document defines how [mailto] URIs
are used to generate notifications by e-mail.
1.2 Conventions used in this document
Conventions for notations are as in [Sieve] section 1.1, including
the use of [Kwds] and the use of [ABNF].
[[no abnf ref: We don't actually need the ABNF reference...]]
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [Kwds].
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2. Definition
The mailto mechanism results in the sending of a new email message (a
"notification message") to notify a recipient about a "triggering
message".
2.1 Notify tag ":method"
The mailto notification mechanism uses standard mailto URIs as
specified in [mailto]. URI parameters with hname "from", "subject"
and "received" are ignored if specified; all other parameters are
accepted.
[[Barry ignored: Should we ignore them, or should their presence be
an error?]]
2.2 Notify tag ":id"
The :id tag has no special meaning for this notification mechanism,
and this specification puts no restriction on its use.
2.3 Notify tag ":priority"
The :priority tag has no special meaning for this notification
mechanism, and this specification puts no restriction on its use.
Implementations MAY use the value of :priority to set a priority or
importance indication on the notification message.
2.4 Notify tag ":message"
o The "From:" header field and the envelope sender of the
notification message are set to the envelope "to" field from the
triggering message, as used by Sieve.
[[Barry from: It might be better in some cases for the
notification to "come from" the sender of the triggering message.
In other cases it might be better for all notifications to come
from the "mail system". I think we should define a way to specify
the behaviour here, perhaps with a new notify tag.]]
[[Barry sender: Should we also provide a mapping or setting for
the "Sender:" header field?]]
o The "To:" header field and the envelope recipient(s) of the
notification message are set to the address(es) specified in URI
(including any URI parameters where the hname is "to").
[[Barry to: I'd like some way to specify that the To: header
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should be retained from the triggering message. In fact, I'd like
a way to say that ALL headers be retained.]]
o The "Received:" headers from the triggering message are retained
in the notification message, as these may help detect and prevent
mail loops.
o The "Subject:" header of the notification message contains the
value defined by the :message notify tag, as described in
[Notify]. If there is no :message tag, the subject is retained
from the triggering message. Note that Sieve variables can be
used to advantage here, as shown in the example in Section 3.
o All other header fields of the notification message either are as
specified in the URI, or have implementation-specific values;
their values are not defined here.
o If the mailto URI contains a "body" parameter, the value of that
parameter is used as the body of the notification message. If
there is no "body" parameter, the body of the notification message
is empty.
[[Barry body: I'd like some way to specify that the body contain
the body of the triggering message.]]
2.5 Other Definitions
Because the receipt of an email message is generating another email
message, implementations MUST take steps to avoid mail loops.
[[Barry loops: We should say more about this...]]
[[comment 1: Mailto URIs focus on the message, not its submission.
There is no way to specify envelope parameters, require encryption or
authentication. Sure enough there is more than SMTP, so mailto is
fine not to address this specific transport, but should we ever need
more, it can not be specified as URI parameter, because there is no
room in its namespace.]]
[[comment 2: Michael tried to get documentation on SMTP-SMS gateways,
but everybody operating one keeps the specification like a precious
secret. From experiments made some years ago, we know some gateways
ignore all messages with empty envelope senders, some do not
implement MIME and some ignore the body. Using empty envelope
senders to avoid loops is not possible and it would not allow to send
notifications about bounces.]]
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3. Examples
Triggering message (received by recipient@example.org):
Return-Path: <knitting-bounces@example.com>
Received: from mail.example.com by mail.example.org
for <recipient@example.org>; Wed, 7 Dec 2005 05:08:02 -0500
Received: from hobbies.example.com by mail.example.com
for <knitting@example.com>; Wed, 7 Dec 2005 02:00:26 -0800
Message-ID: <1234567.89ABCDEF@example.com>
Date: Wed, 07 Dec 2005 10:59:19 +0100
Precedence: list
List-Id: Knitting Mailing List <knitting.example.com>
Sender: knitting-bounces@example.com
Errors-To: knitting-bounces@example.com
From: "Jeff Smith" <jeff@hobbies.example.com>
To: "Knitting Mailing List" <knitting@example.com>
Subject: [Knitting] A new sweater
I just finished a great new sweater!
Sieve script (run on behalf of recipient@example.org):
require ["notify", "variables"];
if header :contains "list-id" "knitting.example.com" {
if header :matches "Subject" "[*] *" {
notify :method "mailto:0123456789@sms.example.net"
:message "From ${1} list: ${2}"
:priority "3";
}
}
Notification message:
Received: from mail.example.com by mail.example.org
for <recipient@example.org>; Wed, 7 Dec 2005 05:08:02 -0500
Received: from hobbies.example.com by mail.example.com
for <knitting@example.com>; Wed, 7 Dec 2005 02:00:26 -0800
Date: Wed, 7 Dec 2005 05:08:55 -0500
Message-ID: <A2299BB.FF7788@example.org>
From: <recipient@example.org>
To: <0123456789@sms.example.net>
Subject: From Knitting list: A new sweater
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Note that:
o Fields such as "Message-ID" and "Date" were generated afresh for
the notification message, and do not relate to the triggering
message.
o Additional "Received:" headers will be added to the notification
message in transit; the ones shown were copied from the triggering
message.
o If this message should appear at the mail.example.org server
again, the server can use the presence of a "mail.example.org"
received line to avoid sending another notification.
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4. Internationalization Considerations
[[Internationalization: What do we say here?]]
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5. Security Considerations
Sending a notification is comparable with forwarding mail to the
notification recipient. Care must be taken when forwarding mail
automatically, to ensure that confidential information is not sent
into an insecure environment.
The automated sending of email messages exposes the system to mail
loops, which can cause operational problems. Implementations of this
specification MUST protect themselves against mail loops.
Additional security considerations are discussed in [Sieve] and in
[Notify].
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6. IANA Considerations
[[IANA to-do: What do we need to do to actually get this set up with
IANA?]]
The following template specifies the IANA registration of the Sieve
notification mechanism specified in this document:
To: iana@iana.org
Subject: Registration of new Sieve notification mechanism
Mechanism name: mailto
Mechanism URI: draft-duerst-mailto-bis (change to RFC----)
Mechanism-specific tags: none
Standards Track/IESG-approved experimental RFC number: this RFC
Person and email address to contact for further information:
Michael Haardt <michael@freenet-ag.de>
This information should be added to the list of sieve notification
mechanisms given on
http://www.iana.org/assignments/sieve-notification.
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7. References
7.1 Normative References
[Kwds] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997.
[Notify] Melnikov, A., Ed., Leiba, B., Ed., Segmuller, W., and T.
Martin, "Sieve Extension: Notifications", work in
progress, draft-ietf-sieve-notify, December 2005.
[Sieve] Guenther, P., Ed. and T. Showalter, Ed., "Sieve: An Email
Filtering Language", work in
progress, draft-ietf-sieve-3028bis, November 2005.
[mailto] Duerst, M., Masinter, L., and J. Zawinski, "The mailto URI
scheme", work in progress, draft-duerst-mailto-bis,
February 2005.
7.2 Non-Normative References
[ABNF] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[Variables]
Homme, K., "Sieve Extension: Variables", work in
progress, draft-ietf-sieve-variables, October 2005.
Authors' Addresses
Barry Leiba
IBM T.J. Watson Research Center
19 Skyline Drive
Hawthorne, NY 10532
US
Phone: +1 914 784 7941
Email: leiba@watson.ibm.com
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Michael Haardt
freenet.de AG
Willstaetter Str. 13
Duesseldorf, NRW 40549
Germany
Phone: +49 241 53087 520
Email: michael.haardt@freenet-ag.de
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