No I haven't! Err, have I? I replied to a personal message about 20 ,minutes ago, but not via email - in fact I've just checked my sent items and I'm sure I haven't, so if an email from me's popped up then something weird's going on...
Sorry the notification was sent to Andy and it was rejected by his host.
I would very strongly suggest that everybody checks that the email address in their profile is valid.