How to block an email address with mimecast (spam filter) : DWU Support Services
How to mark a Gmail message as spam using a filter - Quora
Check your spam score
Google Says Its AI Catches 99.9 Percent of Gmail Spam | WIRED
Hector Martin on Twitter: "Is anyone else seeing a ton of GitHub spam mirrors on Google lately? Take this query: the first result is wrong (it's the user page, not the repo