For me there's no increase in spam delivered to my inbox. But, for years, emails from regular correspondents are marked as spam. I have to make rules to ensure

For me there's no increase in spam delivered to my inbox. But, for years, emails from regular correspondents are marked as spam. I have to make rules to ensure I get non-spam emails. Gmail doesn't seem to learn from interactive choices. Did it ever? Emails I manually designate as spam aren't considered spam in the future.