Hi,
Ok, I've imported many emails, my entire 120,000 names.
The problem is that your importer flags Emails as bad if they go over a certain length, I've had some flagged bad that are really valid Email address.
UPDATE: just had a look at a recent "Failed to Import" notification and it seems that this problem has been corrected, was it a problem in earlier versions, I believe it was... anyway, all seems good now.