Alan J. Flavell wrote:
On Sun, 16 Apr 2006, Jeremy Harris wrote:
[...]
- reject senders not matching the specific auth data
"Rejection" is not as easy as it sounds. We try to reject mail
submissions which present non-existent sender addresses - but mail
client software typically does not react well to a 5xx telling it that
the client's purportd sender address is invalid. We've seen quite a
number of different scenarios in which the client station then
continues to batter the mail server with repeated attempts to send the
mail, more or less indefinitely until the mail admin steps in.
So? Ratelimit'em too. One too many, and into the firewall they go.
It's one way to get then edjicated :-)
- Jeremy (the barbarian)
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