Subject: [[prosuct/service]] review

Hi {{first_name}},
My name is [[your name]] from [[your company]]. I really enjoy your [[relevant content]] and am impressed by how well you’ve done with {{company}}.
I’m reaching out to you because I have a [[product/service]] that I think your audience would appreciate.
Would you be willing to test and review [[product/service]]?
I can provide a free sample for you to review, and three extra ones that you can give away to your audience
Please let me know if you are interested.
Thanks for your time.
[[your name and title]]