SMTP Extension for Longer Email Address
draft-viruthagiri-email-address-length-01

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Last updated 2019-12-04
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INTERNET-DRAFT                                Viruthagiri Thirumavalavan
Intended Status: Proposed Standard                          Dombox, Inc.
Expires: Jun 04, 2020                                       Dec 04, 2019

                SMTP Extension for Longer Email Address
               draft-viruthagiri-email-address-length-01

Abstract

   This memo defines an SMTP extension with keyword "EAML" whereby an
   SMTP server can declare that it is capable of handling longer email
   addresses without any local-part or domain-part restriction set by
   RFC 5321.

   EAML stands for "Email Address Maximum Length".

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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Copyright and License Notice

   Copyright (c) 2019 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
 

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   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.

Table of Contents

   1. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  Background  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3. Relaxing the local-part limitation  . . . . . . . . . . . . . .  4
   4. Relaxing the domain-part limitation . . . . . . . . . . . . . .  5
   5. Framework for the EAML Extension  . . . . . . . . . . . . . . .  6
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  7
   7. Security Considerations . . . . . . . . . . . . . . . . . . . .  7
   8. References  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     8.1. Normative References  . . . . . . . . . . . . . . . . . . .  7
     8.2. Informative References  . . . . . . . . . . . . . . . . . .  8
   Appendix A. Variable Envelope Return Path (VERP) . . . . . . . . .  8
   Appendix B. Sender Rewriting Scheme (SRS)  . . . . . . . . . . . . 10
   Appendix C. Email Address Types  . . . . . . . . . . . . . . . . . 11
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

 

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1. Definitions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

   The term "character" in this document refers to an "octet character".

2  Background

   [RFC5321], Section 4.5.3.1.3 says:

   +-------------------------------------------------------------------+
   |                                                                   |
   |   The maximum total length of a reverse-path or forward-path is   |
   |   256 octets (including the punctuation and element separators).  |
   |                                                                   |
   +-------------------------------------------------------------------+

   [RFC5321], Section 4.1.2 defines the path as:

   +-------------------------------------------------------------------+
   |                                                                   |
   |               Path = "<" [ A-d-l ":" ] Mailbox ">"                |
   |                                                                   |
   +-------------------------------------------------------------------+

   So the path will contain at least a pair of angle brackets in
   addition to the Mailbox. This limits the Mailbox (i.e. the email
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