Due to the large amount of complaints regarding spam, most ISP's now have spam filters in their system, that are triggered by certain words and meanings. If you check your ISP account, you may find that you can select what to retain or delete.
Most ISPs now have fairly sophisticated spam filters in place, filtering by words and known spam origins.
Many ISPs have now outsourced email management to Google, who have superb spam filtering, I almost never get spam in my inbox, and equally almost never have to move a genuine email out of the junk mail folder, which catches on average 70 messages a day, these are deleted after 7 days.
Well I say deleted, I'm not sure they go after leaving the junk mail folder, but they're not actually deleted. I once opened my junk folder to find a couple of hundred thousand emails in there, dating back 5 years.
It seems the google servers had a bit of a fit and redelivered every single spam email...
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