Hi,
did you ever open an account on this server?
If yes, they use an automatic mail system which constantly informs you about price changes and the status of your account (I receive loads of mail spam from them too unluckily for an account opened for a couple of jobs 3 years ago).
You can contact him on sonork and ask him to remove your email from his mailing list or, if you prefer, to close directly your account.
BR
Alex |