1,000 free AirBerlin topbonus miles for registering for Sixt promo
 

https://www.promotion-sixt.com/promotion/form/i/35

Register now for the frequent renter deal from Sixt and topbonus and your mileage account will grow with each and every Sixt rental. The best part: as a start-up incentive, we’ll give you 1,000 topbonus award miles just for registering in June.

Thanks, MileageAddict. :)

I seem to recall registering for something similar with airberlin and Sixt around about this time last year. Once again, I checked the box saying I was a new customer of Sixt (which is sort of true, because I never use them, I find their rates hopelessly overpriced).
So here we go again, hopefully the miles with turn up!

Or you can use a different email address to increase the likelihood you'll get the bonus again.

Thanks

June is over. This promo is dead. No more miles for registering only.

At this I think I can safely post here that these points never turned up for me. Fair enough, because last year I did a similar promotion and got 1,000 miles for it.