SUBJECT: Good fit for you?

Hey FNAME,

How did your promo of [OTHER PRODUCT NAME] go?

If it went well, I was wondering if you'd be interested in a similar product for your audience?

It's my [YOUR PRODUCT NAME]. It's similar to [FIRST NAME OF OTHER PRODUCT CREATOR]'s product/course, but [FILL IN DIFFERENCE HERE].

I'm launching it in [MONTH] and I'd love to share it with you in advance and if you like it (you will) you'll definitely want to join our launch as an affiliate :)

Talk soon!