One of the things I see here is a misunderstanding of spam and how it works. There is very little spam resulting from apps running on your phone or computer.
Spam is a result of your email address being circulated among people and companies on the internet that make money by buying and selling your email address. It only has to be leaked ONCE to get into the system and it takes years to fall out. The only sure way to completely stop emails coming to a specific email address is to close that email account. I research Gmail a while back (Gmail is one of the largest email providers) and found I did not like the information they (Google) were collecting from my emails. So, I changed to iCloud. I canceled my Gmail account and went through months of updating websites and companies with my new email address.
Since then there has been a slowly increasing rate of spam on my new iCloud account. ICloud and Apple's mail client have excellent spam filtering and while I now get around 200 to 300 spams per day, I only ever see a very few (5 maybe?)
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