Your email problem seems to be a different issue to your "I am not a member" issue. The email problem appears to have been resolved for now. That was a result of bulk spamming of the FTH server - some ISPs assumed it was coming from FTH
When/how does the "I am not a member." message show up? If you try logging in with an invalid name, you should get an error message saying 'there are errors in the form below" I see your credentials after your name are listed as "DTM, VC5, EH5". Has that changed recently? If you have a cached name and password, the system might not be finding the correct match.
Your website is set up to include the "I am no longer a member" message. If that is accidentally clicked you will be moved to the former members list at the time it is clicked, which could be some time before your next login attempt.
If none of that resolves your issue, please post an image of the error message.
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