I think worst than the spam problem is the deliverability problem. Worst case I can hit the delete key on spam. (as an aside, most of it is immediately obvious

I think worst than the spam problem is the deliverability problem. Worst case I can hit the delete key on spam. (as an aside, most of it is immediately obvious from the subject line alone, which makes it hard to believe that it's such a hard problem). But getting mail delivered from a private server to major email providers like gmail, yahoo, outlook, is difficult.