I got an email from
[email protected] telling me there may be fraudulent activity on my account. So I called the 480 phone number that was in the email, gave my cc number, and authorized overseas purchases. A few hours later, a unrecognized charge for "unicef" in the amount of $1 showed up on my account. So I called Chase back. This time I used the number on the back of my cc. Chase verified that the 480 number was legit. They had record of me calling earlier in the day.
The UNICEF charge turned out to be bogus, but that's a different story. It wasn't related to the email or the call to the 480 number...