"Margaret" == Margaret Olson
<margaret(_at_)margaretolson(_dot_)com> writes:
Margaret> The rate limiting needs to occur on the sending side,
Margaret> but the receiver needs to know what it is.
But there's no need for the sender to publish the rate limiting
information, because there's little reason for you to trust them.
The trust issue is not relevant.
The sender is publishing a CLAIM. It is for the receiver to validate
the claim and decide whether/how to act on it.
Obviously the ISP's rate limiting policy would have to specify the IP
addresses that they're responsible for (they can't rate limit mail you
send out via another source) but this is all information that should
be published by the ISP, not the sender.
The sender has to inform the recipient of the existence of the data.
Though, as I said before, I'd like to see a move towards (return to)
sites originating (and being responsible for) their own mail rather
than relaying through their ISP...
The anti-spam zealots have done for that plan. Port25 is mostly blocked.