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Welcome to [name of what they signed up for]!!
Why you're excited they're here. A little bit about you, and the course/program/etc. What can they expect.
Thank you,
[your name]
PS. This is a great place to link out to some helpful "getting started" or "best of" type resources that are related to the above product/download.
This is a great welcome email for a course or opt in.