How many emails is spam?

From mailing lists. Spammers regularily attempt to get the lists of subscribers to mailing lists [some mail servers will give those upon request], knowing that the email addresses are...

The term spam refers to bulk emails that are generated automatically rather than being individually composed, and which generally are used to advertise products that you wouldn't actually want to buy...

spam, bulk email, unsolicited email. Same as the junk mail your mailman leaves in your mailbox. Over time Spam also has added malicious code. in other words TRASH that takes up all your Email space...

E-mail spam, also known as junk e-mail, is a subset of spam that involves nearly identical messages sent to numerous recipients by e-mail. A common synonym for spam is unsolicited bulk e-mail (UBE).

I assume you mean e-mail addresses. I don't believe there is a central registry where you can get accurate data. There are surely billions, if not more. There are many people - especially poor people...