Hi {{contact.first-name}},
I hope you're having a great day!
I'm reaching out from [newsletter name], where we're dedicated to providing valuable content to our [describe your audience] audience. I came across your company and thought there might be a great opportunity for us to collaborate.
We're currently seeking sponsors and advertisers who are interested in reaching our engaged readers. With [brief description of your newsletter's reach and engagement metrics], I believe partnering with us could be a win-win.
Would you be interested in exploring this opportunity further?
Warm regards,
[your name]