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Problem is they hack the weak link and they get everyone's email that they use to spam again and again. I make rules to auto delete the usual spam but still some things slip by obviously. I personally get a lot of spam and phishing emails because they are old accounts and when you get in their list i doubt you ever get out.
Facebook, social media, Monster.com and similar, etc - put your email address out there and spamming is inevitable. Eliminating or greatly reducing spam means living no online social media life, creating few accounts and changing email accounts until it basically stops. The alternative is just to use secondary email accounts for the purpose of general online web activity.