If you were doing everything right it would work, unless you sent email from an IP known to send spam in the past. That doesn't necessarily mean you did, but it

If you were doing everything right it would work, unless you sent email from an IP known to send spam in the past. That doesn't necessarily mean you did, but it does mean your IP did at some point. Given the saturation of the ipv4 space this isn't exceptionally unlikely. In any case, your post is contrarian and doesn't offer any substance aside from the fact that you are angry. That's kind of saddening because that was already pointed out as exactly the problem.