Do you mean that the message was addressed to:
[email protected], or to your personal email address with "Dear Oxenos" or similar in the body of the email?
I have not seen any reports that the PPRuNe servers have been hacked.
Nor have I seen any other reports from anyone else that their registration / personal (non-PPRUNE) email address has been compromised.
This is not to say that it hasn't occurred, just that I haven't heard about it!
SD