New Order: Id 113515915. I got 2 emails not intended for me plus one the other day (Renderosity business)

In the email from Renderosity which followed this issue, the following was stated:

The new mail system is an important step in giving you more control over the mail you receive from us. Unfortunately, we discovered an obvious flaw today. This was a limited test, and we immediately disabled the new system afterwards. We have fixed the problem, and we are reviewing the new mail system to ensure this will not happen again. The security of Renderosity was not affected by this incident.

The security of Renderosity was not affected but the security of members was because mail addresses of Renderosity members were listed in the "TO" line and therefore visible to the reader. I counted over 50+.

I'm concerned because there are members who sign up to Renderosity that are here for phishing or spam related business and now there is possibility one of these fake members received the email.

So, is this "new mail system" why I missed the 50% off sale?