ietf-dkim
[Top] [All Lists]

Re: [ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs

2010-09-28 03:14:28
On 2010-09-27, John R. Levine wrote:
And since this group seems to be obsessed with arcane corner cases,
what do you do with a discardable message if it's sent to two addresses,
one of which is a mailing list and one of which isn't?

That's a trivial specific case, of a general problem important in
spamfighting.  While a perfect solution would indeed require an extension
to SMTP, we have ways to approach it.

(Basically, give 4xx's at RCPT TO: when about to accept mail to boxes
with divergent filters.  But since this delays mail, when possible just
merge the competing filters into one common denominator, accepting
possible "overblocking".)

But it's not even a problem for modern mailing lists.  They can afford to
send a "bounce" message in this case, as they already have a confirmed
opt-in communication channel to talk with their subscribers.

It wouldn't work out if a non-subscriber posts to the list, but for other
reasons, modern lists make it a requirement to opt-in subscribe and then
suspend delivery, should one want to post without reading.

---- Michael Deutschmann <michael(_at_)talamasca(_dot_)ocis(_dot_)net>
_______________________________________________
NOTE WELL: This list operates according to 
http://mipassoc.org/dkim/ietf-list-rules.html

<Prev in Thread] Current Thread [Next in Thread>