Using classic Outlook for Windows in business environments
Yup, that is the best solution. If your email has been used for years, circulating on spam lists, and has probably been part of one of the many, many, breeches over the years, the best solution is to abandon it, and get a new one. It's really hard as it has become part of your identity, and the burden of having to let your friends know, port over your data, and change your email with.... everyone! What a headache! But I think in this day and age that's going to have to part of regular email hygiene--new address every few years and now Email masking which I see Firefox has started offering. Hopefully one day we will advance as a society and get rid of this noose. Email has been an un-fun, time waster for years now.
I've been having the problem for a week now, so I'll stick around a while and see if the spam filter improves--it has in the past.