Purelymail had a blog post a few years ago where they said the same: https://news.purelymail.com/posts/blog/2019-06-21-deliverability-for-the-rest-of-us.html h

Purelymail had a blog post a few years ago where they said the same: https://news.purelymail.com/posts/blog/2019-06-21-deliverability-for-the-rest-of-us.html https://news.purelymail.com/posts/blog/2019-06-21-deliverabi... I'm guessing some of the issues are just from Google being random about what it considers spam no matter who it comes from. I remember a comment on a somewhat recent thread from someone who had to move their business mail away from Gmail because Gmail would classify mail from one paid account at their organization to another under the same organization as spam.