In the United Kingdom, the government has launched an initiative to inform its citizens of phishing and other fraud dangers. One of its key services is an email and/or text message service that informs users when new fraud threats are identified.
To fight the problem of having their own emails spoofed, they require users to select a "safe word" that will be used in the subject line of all emails.
Analysis
Not only is this an effective way to fight phishing, it helps personalize your messages, improving their chances of being read.
-- JB