Sieve Working Group B. Leiba
Internet-Draft IBM T.J. Watson Research Center
Intended status: Standards Track M. Haardt
Expires: January 7, 2008 freenet AG
July 6, 2007
Sieve Notification Mechanism: mailto
draft-ietf-sieve-notify-mailto-03
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Copyright (C) The IETF Trust (2007).
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Abstract
This document describes a profile of the Sieve extension for
notifications, to allow notifications to be sent by electronic mail.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Conventions used in this document . . . . . . . . . . . . . 3
2. Definition . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Notify parameter "method" . . . . . . . . . . . . . . . . . 4
2.2. Notify tag ":from" . . . . . . . . . . . . . . . . . . . . . 4
2.3. Notify tag ":importance" . . . . . . . . . . . . . . . . . . 4
2.4. Notify tag ":options" . . . . . . . . . . . . . . . . . . . 4
2.5. Notify tag ":message" . . . . . . . . . . . . . . . . . . . 4
2.6. 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 . . . . . . . . . . . . . . . . . . . . . 12
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].
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 parameter "method"
The mailto notification mechanism uses standard mailto URIs as
specified in [mailto].
2.2. Notify tag ":from"
The :from tag overrides the default sender of the notification
message.
2.3. Notify tag ":importance"
The :importance tag has no special meaning for this notification
mechanism, and this specification puts no restriction on its use.
Implementations MAY use the value of :importance to set a priority or
importance indication on the notification message.
2.4. Notify tag ":options"
This tag is not used by the mailto method.
2.5. Notify tag ":message"
o Unless overridden by ":from", the "From:" header field and the
envelope sender of the notification message are set either to the
envelope "to" field from the triggering message, as used by Sieve,
or to a fixed address (so it "comes from the notification
system"), at the discretion of the implementation.
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 headers where the hname is "to").
o The "Received:" field from the triggering message are retained in
the notification message, as these may help detect and prevent
mail loops.
o The "Subject:" field 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.
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o If the mailto URI contains a "body" header, the value of that
header is used as the body of the notification message. If there
is no "body" header, it is up to the implementation to leave the
body empty or use an excerpt of the original message.
o URI headers with hname "received" are considered unsafe and are
ignored if specified. URI headers with hname "from" and "subject"
conflict with the implictly set values from and are ignored if
specified.
o All other header fields of the notification message either are as
specified by URI headers, or have implementation-specific values;
their values are not defined here. It is suggested that the
implementation capitalizes the first letter of URI headers and
adds a space character after the colon between the mail header
name and value when adding URI headers to the message.
2.6. Other Definitions
Because the receipt of an email message is generating another email
message, implementations MUST take steps to avoid mail loops. The
notification message contains the "Received:" fields from the
triggering message to allow loop detection as described in [RFC2821],
section 6.2. The implementation MUST allow messages with empty
envelope senders to trigger notifications.
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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 :message "From ${1} list: ${2}"
:importance "3"
"mailto:0123456789@sms.example.net";
}
}
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:" fields 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
This specification introduces no specific internationalization issues
that are not already addressed in [Sieve] and in [Notify].
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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
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: RFC2368
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.haardt@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] Hoffman, P., Masinter, L., and J. Zawinski, "The mailto
URL scheme", RFC 2368, July 1998.
7.2. Non-Normative References
[RFC2821] Klensin, J., Ed., "Simple Mail Transfer Protocol",
RFC 2821, April 2001.
[Variables]
Homme, K., "Sieve Extension: Variables", work in
progress, draft-ietf-sieve-variables, October 2005.
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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
Michael Haardt
freenet AG
Willstaetter Str. 13
Duesseldorf, NRW 40549
Germany
Phone: +49 241 53087 520
Email: michael.haardt@freenet.ag
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