Spam is an issue, but it's not the one that impacts me the most. I rarely get true 'spam' in my inbox. What impacts me the most is a never-ending problem with

Spam is an issue, but it's not the one that impacts me the most. I rarely get true 'spam' in my inbox. What impacts me the most is a never-ending problem with Gmail classifying messages as spam that were actually important to me. Time sensitive announcements of meetings or events, for example. Many are coming from senders I've been receiving email from for years. Gmail is convinced that almost every technical-related email mailing list I'm on is a spam source, despite my constantly going into my spam folder and telling it dozens of messages from those mailing lists are not actually spam. Meanwhile, what I do get is a barrage of promotional emails - what I consider very much to be spam - from corporations that at some point have had my email address and now email me multiple times a week. Those sail right past the spam filter into my "promotions" folder and accumulate...