Here are senders among the last 10 messages sent to spam in my gmail account:
I have tried adding email addresses to my contacts in the past and it's done nothing. The only way to get a lot of these to show up in my inbox is by creating specific filters to let them in. Doesn't Google realize that we actually use banks and credit cards, and not every message is a phishing attempt? Amazon has so many different email addresses I have to have filters for all of them (and clearly missed one) so I can get info on my orders.
Also, clearly marking things as "not spam" does not help the system learn in any way.