Hi, I tried to send a mail with a question/suggestion to cpcretrodev.org@byterealms.com but it came back ("unsolicited mail from your IP address")... What's the best way to get in contact with the organizers team? Thanks!

Well, actually that's the email. That error is quite odd, as it is similar to telling you "you are spam, man". 

We have checked email configuration today and everything seems correct. We have received other emails without problems.

Can you try again? If it fails again, can you try a different mail address and tell us which one was the first to see if we can traceback the issue?

Yes, but usually, I'm not spam ;-)

I just tried again from a different address...

Being actual spam could be quite claustrophobic :)

We have received your email, and I can confirm that we also received your previous one. I have seen it on the webmail. However, for some sort of reason (may be related to the error you received), the email wasn't forwarded to the members of the organization.

We will answer you soon :)

Yes, I hope I'll never end up as real spam. 😨