Folks in the tech sector really do try to reduce spam.
Here’s a snippet that reveals what they’re up against:
We receive 25,000 mail connections per day; each connection is an attempt by some machine to send us mail. Of those 25,000 connections we are able to reject nearly 80% of them outright since the IP address of the originating machine is registered as a known spam offender. Using various additional checks and methods we are able to reject about 98% of all incoming connections before they even have a chance to send us message content. Of the 2% that do make it to the point where they send us a complete mail message we are able to reject 25% of those as containing spam, a virus, or an unsafe attachment type. That means that in the end only 1.5% of all attempted mail connections actually result in delivered mail.