A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : SMTP Client Address Authorization (SMTP-CAA)
Author(s) : D. Otis
Filename : draft-dougotis-smtp-caa-00.txt
Pages : 11
Date : 2004-5-19
The helo/ehlo domain reported by a client at the beginning of an SMTP
[RFC2821] session has largely been ignored without reliable means to
verify this information. To properly recognize a domain sending
mail, the domain of the client must be verifiable. This document
utilizes a DNS SRV record that extends the definitions for fields of
this record as defined in [RFC2782] where the label becomes unique by
appending a label of "__caa" following the Proto field. Server
verification of permitted client addresses becomes possible as a
method to confirm the domain of a client without having prior
information shared. Cooperation between client and server domains
utilizing this method exclude third party masquerades as originating
from within cooperative domains. Initially only a notice of Unknown
or Unconfirmed will be added to mail from uncooperative domains
unless the domain is determined to be not valid, where then the mail
will be refused. This added notice provides assurance the server is
checking client domains in addition to alerting users to the level of
mail compliance on received mail. Once use of this method is common
practice in conjunction with other means for confirming the client
domain, mail may be refused if the client and/or domain fails these
confirmation checks.
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