Can't login because I don't get activation/validation e-mails anymore

For some reason I am unable to get any kind of e-mail from TeamViewer anymore (last ones were from 2 years ago, I haven't used the service since).

I had to create a new account just to post here, and I didn't get any of the requested validation e-mails on this address either. I am 100% sure this isn't a spam folder issue.

Is my account or domain on some kind of blacklist ? Do I have to create a third account with a more common domain address (gmail, etc.) or something ?