Okay, so that was odd. Turns out Mom's problem with email was that it wasn't actually sending it, and thunderbird wasn't telling her that it was not sending. At some unknown point in the past when our ip address changed, and my server stopped forwarding mail for the house, thunderbird didn't start popping up error messages as it normally does. Very odd. So I upgraded her thunderbird version from something to 1.0, and then resent all her email from the 24th on, since the last she remembers getting replies was the 22nd (and apparently she didn't send anything on the 23rd).
