[email protected] wrote:
So if they've decided it's spam, what's the problem with
throwing it away?
The same problem as always: False positives. While I think the various
admonitions we have in various documents that try and discourage
silently dropping messages are unrealistic, the fact remains that
silent draps create reliability issues. Rejects address this issue and
are preferable, as long as they don't create additional issues.
Ned
+1.
As a public note for the unaware, the new RFC 5321 for the first time
ever, has "cracked opened the door" with new SMTP semantics allowing
or provides a rationalization for discarding of mail under
"reasonable" circumstances.
IMV, having new official RFC mail protocols specifically designed for
this purpose is rational and reasonable, such as RFC 5617 (ASDP) with
its DKIM=DISCARDABLE policy. As long as the ADSP domain publicly
exposes this self-asserted policy, I don't think it contributes to
false positives discarding of accepted but zero false positive proof
for ADSP violating mail.
However, one implementation question is when a DATA level ADSP based
(55x) rejection can also serve the same purpose for ADSP domains.
Currently this only seems to be a problem for DKIM resigners ignorant
of errant or spoofed ADSP protected mail submissions. Murray's Mail
List Manager (MLM) draft proposal hopes to provide, IMV, "sound
protocol consistency" guidelines in this area for DKIM+ADSP compliant
List Server and SMTP receiver developers to consider.
--
Sincerely
Hector Santos
http://www.santronics.com
