On Mon, 2017-12-04 at 15:20 -0500, Joseph Brennan wrote: > New rule: TO_NO_BRKTS_DYNIP > > Since TO_NO_BRKTS_DYNIP is 2.361 and its component RDNS_DYNAMIC is > 2.639, one gets an even 5.0 score just for sending from ec2-54-225- > 189-51.compute-1.amazonaws.com without < > around the To address. > > Should the amazonaws.com hosts not be in RDNS_DYNAMIC? I'm not silly > enough to say they are free of spam customers, but they are > definitely servers. > > Joseph Brennan / Columbia U > >
Mail servers don't generally have generic reverse DNS, if they don't want to be mistaken for end-user IPs or spambots. https://aws.amazon.com/blogs/aws/reverse-dns-for-ec2s-elastic-ip- addresses/
