Bayesian filter
Email Deliverability. A statistical technique that detects email spam. To detect spam, a Bayesian filter compares the words or phrases within the questionable email to a set of known words or phrases associated with spam. As it has a very low rate of false positives, Bayesian filtering succeeds as a method for filtering spam.
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Report Spam when discovered
If you discover that a Twilio customer sent spam, report it to Twilio. Twilio bans their account immediately.
US recipients can also file a report with the US Federal Trade Commission.
To validate the sender of an email message, a system might use a challenge-response filter.