Cannot activate on new computer using existing email

I bought a new computer and have downloaded DraftSight.  I get the activate box, fill it out, and get no email.  Five times now on five different days.  Not in spam, no proxy settings, etc.  I originally had the mac version, and when I downloaded the windows version a few years ago, I had the same problem, but I've run out of email addresses.

How can I get the program activated?  I'm about read to set up a dummy email address just for that, but I'd really like to not do that.