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Just upgraded to v16 and find that some of the anti spam functions have broken.
1. RDNS check not working properly - After upgrade started getting lots of email from one of my mail servers landing in spam, looking at the spam headers it shows Reverse DNS as a failed check which cant be right as the server IP has RDNS.
2. So I added the IP of this server to the IP Bypass to stop the checks and still emails from the server are being spam checked and landing in my spam folder.