Activation Key not received

Good morning to all.
I recently installed DraftSight on my Ubuntu 14.04 and sent an email (using the software form) requesting the Activation Key. I didn't received the key and it's the second time it happens. Some weeks ago I did the same with another email account but I didn't received anything. How can I move to activate my DraftSight personal?
Thanks for support.
Best regards,
Dr. Giulio De Riccardis