Dnia 7.10.2019 o godz. 17:17:32 Brandon Long via mailop pisze: > > If content analysis was sufficient, why would anyone bother with all of the > other signals?
Mostly to save time and computing power maybe? With thousands of messages sent from a particular IP, content analysis of each one of them is CPU expensive and time-consuming. Checking the IP blacklists, email headers and so on is lightweight compared to content analysis and allows for preliminary filtering of confirmed spammers. Then the rest of messages (much smaller in volume) goes through content analysis and the content analysis decides if the message is classified as spam or not. At least that's how I always configured spam filters when I was working as admin for much larger mailservers than my current personal one :) But for small senders content analysis alone is pretty sufficient. If you have a sender who sends 20 messages per day, you can run them all through content analysis. Even if one or two spams get through, it's virtually no harm for anyone, contrary to the situation when - let's say - 5 non-spam emails are mis-classified as spam and end up in the spam folder. This causes quite considerable harm. > Sure, you can send me a couple to take a look. Thank you. As currently it is 2:30 in the night in my timezone, I really, really need to go to sleep now. I will prepare the zip file and send it to you tomorrow. Or maybe you prefer to share it via GDrive? BTW. I also sometimes (quite rarely) send messages from my server using two other sender addresses corresponding to two small organizations I belong to. They are in different domains. I also tried to send mail from those two addresses via AWS (while one of these addresses wasn't used as sender for over a year) - both were classified as spam. As the "Received" headers referring to my server were removed, the only thing that they could have common with my server is the "rafa.eu.org" domain in the Message-Id and maybe a few other headers. So I suppose that just a presence of this domain anywhere in the message causes it to be classified as spam. Why? -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
