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I have just implemented the latest version 4.0.0.768. After the initial scary part where everyones emails are getting temp rejected, I started to see how nicely this works. Just some thoughts I would like to get out after getting greylisting going.
1. I cant seem to edit the 421 Reject Msg for Greylisting. I'd prefer not to let them know how many minutes. I mean its not like someone is sitting on the other end and says ohh their server says to wait 5minutes before retrying ok lets wait. I think it just gives spammers another way to learn your setup. I have seen others ask to edit this message with no response from Logsat.
2. With Greylisting now enabled, all my nice exciting stats showing all these emails getting blocked are gonna go way down. Kinda takes away that feeling of winning the battle. I mean i know theres less strain on the server, resources etc.. But I always liked to see how efficient all my filtering was.
3. Greylisting seems to be mostly beneficial for large organizations. Am I wrong? I mean we only host around 600 mailboxes for our clients. Before greylisting we had around 90,000 emails in quarantine. So we arent huge by any means. But it just seems that this isnt going to be super effective for someone small like me. But even so, I dont see any downside to using greylisting. To me it only helps keep out those initial junk mailservers. The most persistant ones will get by the greylisting, but to what, to get nabbed by the other slew of filtering mechinisms setup, SURBL,MAPS,KEYWORDS,PTR,MX,IPs. So I mean the only downside is a short delay on first attempts from valid people. I dont see the big deal. I mean a client of ours uses MS Exchanges POP Connector. That cant even retrieve email sooner than 15minute intervals.
4. When someone emails us for the first time, does that sender themselves get an email with the 421 message? Or does their email server just log that information and re-attempt delivery, without the sender even knowing we have greylisting in place?
Ok if anyone bothered to read my mind dumping I appreciate it and any comments or info you can provide is always appreciated.
Joe
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