Can you Private Message me an email address that you're trying to use? We'll have to test on a development system to see if we can recreate the problem and implement a fix in Autotune (if possible) to understand the problem.
You can PM me by using the mail icon to the left.
If there's anything specific about your email addresses that may be causing the problem, let us know that too.. specifically:
* Are there any non-latin (UTF-

characters in it?
* Is it from a standard domain (.com, .org, .net) or a not as common domain (.tk, .ua, etc)?
If we can narrow down what's unique about the email addresses you're trying or whatever else is common to your problems, that will help us find a solution faster.
Thanks,
Alex