Most partnership emails get ignored because they are vague, self-centered, or too long. The ones that work follow a simple structure: specific compliment or reference, clear value for them, concise ask.
Start by showing you understand their business. Reference a specific product feature, blog post, or audience segment. Then lead with what they get from the partnership, not what you want. Be specific: 'our 12k newsletter subscribers overlap with your ICP' is better than 'we have a growing audience.'
Keep the email under 200 words. Partnerships require trust, and trust starts with respecting their time. End with a low-friction CTA like a 15-minute call, not a multi-page proposal. The proposal comes after the first conversation, not before it.