Last Saturday OK Mail said that they'd stop sending me spam within 5 working days. However, I've just recieved more spam from them. I'm not what I can do about it, but might try complaining
here. OKM is a UK company, with their address listed as:
OK-mail Limited
30 Buckingham Gate
Victoria
London
SW1E 6NN
I've filled in the "contact us" form on their site, but don't expect a response.
Anyway, just to be safe, I've tried unsubscribing again. If I get anymore spam from them next week I'll fill in the complaints form and see what happens.