Greylisted
Monday, April 30th, 2007Today I installed postgrey to see if I could cut down the amount of spam that my mailserver receives. It is really pretty annoying to get all this spam, and then to have to review my junk folder to make sure it really is spam.
Postgrey is a greylisting service. The idea is simple: When an e-mail arrives, my mailserver will tell the remote server that the local recipient (i.e. me) isn’t available, but try again in five minutes. Normal mailservers will dutifully try back again in five minutes, and the mail will be let through. Spam servers, on the other hand, generally ignore such responses since they are too busy annoying other people by that point.
It will be interesting to see how well this works! I especially hope I don’t miss any important e-mails, but it’s not like I get a lot of e-mails anyway…
