SUBJECT: Congrats!

Hey FNAME,

Congrats on doign so well in the [OTHER PRODUCT NAME] launch!

This/Next [MONTH OF LAUNCH] we are launching our [YOUR PRODUCT NAME]. It's similar to [FIRST NAME OF OTHER PRODUCT CREATOR]'s product/course, but [FILL IN DIFFERENCE HERE].

IF you are interested in joining the launch, let me know. Love to share more info. with you.