Added 2 domains of 3rd party reqruiters

Received multiple e-mails from addresses of these hosts (eurostaffgroup.com and eurostaffsolutions.com), all quite impersonal. Tried to unsubscribe from these lists, but their mailinglist service always returns a 500 and the people sending these e-mail either don't listen, or reply to me as follows after asking to be removed from their address list:

> I know you are currently  NOT looking, but maybe you know of a colleague/friend looking for a change?