We tried to analyze this behavior over employee inboxes on a company using Gmail exclusively and we saw that the users that routinely use the spam button as oft

We tried to analyze this behavior over employee inboxes on a company using Gmail exclusively and we saw that the users that routinely use the spam button as often or instead of the trash button are ignored on the spam markings (not reported to Amazon SES as spam). I think too many users have gotten used to abusing the spam button like that and that's why Google is ignoring those users.