On Tue, 1 Apr 2003, Matt Sergeant wrote: > I have written a plugin that uses DB_File to store the IP address of > incoming connections. If it's the first connection from that IP address it > returns DENYSOFT. Otherwise it lets it continue. ... > I didn't invent this idea - lots of people have suggested it before now. > It's just dead easy to implement in qpsmtpd... The theory is that spammers > don't queue - they fire and forget. ... > So far, no spam today, and lots of DENYSOFT's returned.
Presumably some of those being false positives, which delay mail delivery. IIUC, the usefulness of this will degrade over time as repeat connections arrive from perviously used addresses. But with 4billion addresses to choose from, it'll take spammers a while to use all of them. Sounds like a nice little idea. -- Charlie
