none of it is spam.your spam filter sucks
well, ok, maybe ~10 spam emails/day on my work inbox.
most of it is either company-wide stuff or automatically generated status emails (which don't really matter unless we get a flood of failures; personally, I'd just as soon not send out status emails *unless* it's a failure, but it's not my call to make). I've got a bunch of filters setup to drop it all into appropriate folders.
I get maybe ~100 emails/day that I legitimately have to read... my department operates 24/7 out of multiple offices around the globe; most departmental communication is done via email.