Sieve Vacation Extension: "Seconds" Parameter
RFC 6131

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Internet Engineering Task Force (IETF)                         R. George
Request for Comments: 6131                                      B. Leiba
Category: Standards Track                            Huawei Technologies
ISSN: 2070-1721                                                July 2011

             Sieve Vacation Extension: "Seconds" Parameter

Abstract

   This document describes a further extension to the Sieve Vacation
   extension, allowing multiple auto-replies to the same sender in a
   single day by adding a ":seconds" parameter.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6131.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

George & Leiba               Standards Track                    [Page 1]
RFC 6131            Sieve Vacation: Seconds Parameter          July 2011

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.1.  Terminology Used in This Document . . . . . . . . . . . . . 2
   2.  The ':seconds' Parameter  . . . . . . . . . . . . . . . . . . . 2
   3.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
     5.1.  Registration of Sieve Extension . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 5

1.  Introduction

   The Sieve [RFC5228] Vacation extension [RFC5230] defines a mechanism
   to generate automatic replies to incoming email messages.  Through
   the ":days" parameter, it limits the number of auto-replies to the
   same sender to one per [n] days, for a specified number of days.  But
   there are cases when one needs more granularity, if one would like to
   generate "vacation" replies more frequently.

   This extension defines a ":seconds" parameter to provide more
   granularity for such situations.

1.1.  Terminology Used in This Document

   The upper-case 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 RFC
   2119 [RFC2119].

2.  The ':seconds' Parameter

   The purpose of the ":seconds" parameter is to specify the minimum
   time interval (in seconds) between consecutive auto-replies to a
   given sender.  The ":seconds" value, if specified, is used instead of
   the ":days" value, and works in a similar way (see the Vacation
   extension [RFC5230] for details).  Only one of ":days" or ":seconds"
   is allowed -- use of both parameters in the same vacation action MUST
   result in a Sieve processing error.

   The capability string associated with this extension is "vacation-
   seconds".  Note that "vacation-seconds" implies "vacation", and a
   script with "vacation-seconds" in a "require" list can omit
   "vacation" from that list.

George & Leiba               Standards Track                    [Page 2]
RFC 6131            Sieve Vacation: Seconds Parameter          July 2011

   The time value is specified in seconds, and MUST be greater than or
   equal to 0 and less than 2**31.  All valid values, from 0 to 2**31,
   MUST be accepted without error.  Sites MAY define a minimum effective
   value and/or a maximum effective value.  If a site chooses to do
   that:

   1.  Call the value specified "v(spec)".

   2.  Call the minimum effective value "v(min)".

   3.  Call the maximum effective value "v(max)".

   4.  Call the actual effective value used by the processor "v(eff)".

   5.  The following apply for determining v(eff):

       *  If 0 <= v(spec) < v(min), then v(eff) = v(min).