Sending coupons to new subscribers (MyMail Integration)

[cantinaprimore]

I would like to automatically send a welcome Discount Coupon to every new subscriber, that can be used just once. I have created an specific coupon for that but:

* If I set 1 as Limit coupon redention, it would be only used by the first subscriber, and wont' be available for the followings;
* If I set 999 as Limit coupon redention, everybody could use it more than once.

Is it possible to do this?

I have integrated MyMail to EasyCart, but I failed to find a way to customized every automatic welcome e-mail for new subscribers.

Any ideas?

Thank you very much in advance.

Natalia