These are all the action and filter calls in WP 2.5.0. For each call I show its arguments and where it occurs into the code.
Last week I got a marketing email from PayPal. It looked like scam because it was also mailed (apparently) to someone who is not me. The footer said: This email was sent to xxxxxxxxxxx according to your preferences. I forwarded the email to PayPal anti scam service, but they confirmed it’s genuine. 😐