When is IMAIL can support the following feature?
Tarpitting (recommended)
This feature is very effective against Trial and Error Harvesting. Administrators can configure VisNetic MailServer to check for unsuccessful attempts to deliver messages to unknown users by external or local non-existing users. If the number of attempts in a session exceeds the number specified by the Admin, the IP address of the sender will be remembered for that period and no access from that IP address will be allowed within that period. We recommend a count of 3-5 and a period of 60 to 240 min.
That's not tarpitting -- whoever wrote that doesn't know what they are talking about. :)
"Tarpitting" refers to a technique where if you have identified that an E-mail being received may not be legitimate, you slow down the connection to the point where it typically takes 1-2 days to deliver the E-mail (by sending continuation commands, at a rate of about one a minute). The idea is that it clogs up the sending mailserver, so that if the spammer sends his own mail, it will slow down, and if they are using an open relay, the problem will hopefully be discovered before the E-mail is delivered.
What they are referring to above is to help with dictionary attacks, and is something that IMail does not have (nor can an addon easily be created to do). For dictionary attacks, people here have had the best luck with BlackIce Server.
-Scott
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