On Thu, 5 Oct 2017 12:41:52 +1300, I wrote:
I am currently messing about with a virtual private server at Rimu Hosting, with a view to have it take over my e-mail serving after Vodafone turns off its provision of that service.
I have it working, to the point where I have set the highest-priority MX record pointing to my server (with Vodafone still there as a backup). On the down side, I am now seeing all the spam that Vodafone was previously filtering out for me. On the bright side, most of it has some fairly simple characteristics that I can use to configure Postfix to simply refuse to accept delivery: * particular forms of e-mail address that I have never used online, or last used decades ago * connection attempts from IP addresses that have no names in the reverse DNS * malformed HELO handshakes Here are some stats from my system log on rejections based on the above criteria, since about 4pm October 3rd: “Recipient address rejected” -- 211 “Helo command rejected” -- 187 Currently about a dozen pieces of spam per day are making it past these checks. So about 75% is not even being delivered to me. I think I can live with that--if it doesn’t get any worse. ;) Also there are some attempts to see if I’m running an open relay: “Relay access denied” -- 40