It's not just e-mail that's susceptible to simple breaches of privacy. Snail mail can be just as vulnerable.
Last year, the Family Medical Care Plan sent letters to members of the National Electrical Contractors Association and the International Brotherhood of Electrical Workers that had their Social Security numbers printed on the envelopes.
The medical plan apologized to its members but said the numbers didn't have dashes to indicate they were Social Security numbers, according to a notice filed with the California Attorney General's office. The medical plan did not respond to a request for comment.