I'm talking about the temporary blocking of an IP address that has made x number of bad recipient attempts in a given amount of time, as opposed to blacklisting where an IP address is tossed into the bucket.
OK, that sounds like some sort of dictionary attack protection. It would indeed be nice if IMail had the ability to do something like that.
I'd say that, unless ISPs start blocking external port 25 traffic from client connections (we're considering it), it may soon be a necessity. The problem with port 25 blocking is, of course, that it totally screws with SMTP Auth. We've had a couple of customers whose ISP has blocked outgoing port 25, and now we're faced with having to find some way to allow access through some higher port, as these are roving machines.
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