I actually have several email accounts, but I view all of them in a ‘merged’ inbox in my mail app. I don’t really know the exact reasons why I receive so much spam or whether it is ‘common’ to do so.

I believe most of my spam mail originates with companies I bought things from, news sites I’ve registered on, and legitimate companies that have re-sold their mailing lists. On that basis it isn’t technically ‘unsolicited’, but it isn’t advertising stuff that I’m actually interested in.