Your email would be the evidence, but the 0 point is reserved for unknown account holders, like Blitz.
As long as we sent anything to your email, we know that you're a customer and other points criteria should apply.
Also Mt. Gox codes can prove your account ownership as well. We have all deposit records since February.
Makes sense. Has anyone using gmail found bitcoinica emails marked as spam?
Didn't notice I was "missing" emails before today. Still a little worried.

It shouldn't. We use a 3rd party emailing service to ensure deliverability and we have proper DKIM signatures and SPF records set up.
Mt. Gox deposit never sends emails. Only for Bitcoin and Wire deposits, all withdrawals and orders that you request for notification by default.
A fool's reliance on certification and a false belief in easy to get signatures. Means shit if your content looks like spam. Those signatures just prove the domain owner is sending the mail, *nothing* about its content -- and in light of recent hacks maybe not even that.
I know first hand that a mail server running dspam put all my bitcoinica mails into spam. Training was/is done with personal data and a few spamtrap adresses.
-coinft
I'm sure that the vast majority of the emails have been delivered successfully. Our email service provider (Postmark) has very strict rules about emails, and we are not even allowed to send newsletters through their platform. Bitcoinica's transactional emails all originate from trusted IPs.
The content isn't like spam either. The HTML email template was professionally designed and the content is has a transactional nature (i.e. not sent in bulk).
I'm not sure about the support emails though.