He misinterpreted his server's logs. The script is sending from that address to his. That's the only way it could reach his server.
If the script was sending to
admin@flashfxp.ws, the MX server of the flashfxp.ws domain would be contacted, not his.
note: thread moderated and splitted
note 2: support@inicom is aware of your situation and will deal with you in private when possible.