So what does that translate to for Imail? Max two sessions? 1 bad recipient, then blacklist it? That seems awfully low.
IMGate doesn't blacklist in a session. It disconnects the session after 2 5xx's.
Eventually, through harvesting the mail log, enough sessions with (even one) bad recip, and the IP gets blacklisted. How many is enough? over how much time? day? week?
The threshold depends on several other factors. eg, if the IP doesn't have a PTR, then the blacklist threshold is a lot lower than if it had an IP.
And John is right. A gateway that accepts all recips and passes them to Imail is asking for trouble, is a useless gateway. Rejecting bad recips is the FIRST task of an MX gateway.
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