A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Verified-Hello SMTP extension
Author(s) : A. Vesely
Filename : draft-vesely-vhlo-05.txt
Pages : 26
Date : 2009-12-18
This SMTP extension is designed to ease whitelisting. It provides a
VHLO command verb for weak authentication of SMTP clients. Weakly
authenticated clients enjoy an intermediate level of trust: they have
no relying privileges, but can attempt to deliver mail to local
users, are whitelisted from some filters, and may receive DSNs as
needed.
Weak authentication methods are of two kinds: On the one hand the
sending domain must be vouched for by a trusted third party (VBR).
Short of a "Mythical Global Reputation System", domains within a
closed set may still enjoy mutual whitelisting by setting up their
own ad-hoc vouching server. On the other hand, the sending host's
affiliation with the mail domain is checked by DNS lookups (MX, PTR,
or SPF) or using DKIM "Author Signature". DNSBLs and Greylisting are
also considered.
Servers provide feedback to their clients about which vouching
services or authentication methods they require. That way they have
a means of spreading their choices. This feature is intended for
easing rapid diffusion by word of mouth of those reputation system,
as well as of popular authentication methods. A IANA register is
defined for extending the set of available methods.
Status of this Memo
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