On 8/19/10 9:59 AM, Steve Atkins wrote:
If they're spam filtering based on sender reputation then the dkim
token is a much more reliable, and cheaper to maintain, token than
peer IP address. It'll make their existing reputation-based filtering
more effective, and reduce the maintenance overheads.
It'll also make them ready for IPv6, where IP based reputation is
going to get somewhat more difficult to manage.
IMHO, cryptographic authentication of the SMTP host is needed instead to
immediately curtail any subsequent traffic. In addition, DKIM does not
confirm where the domain sent the message, which makes using DKIM to
negatively impact a domain for unsolicited email something easily
poisoned. Perhaps we should put together an I-D that uses a DKIM key
with SMTP Auth instead to be ready for IPv6.
-Doug
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