Proposal Cover Letter

Write a professional cover letter to accompany a business proposal with the following details:

Sender Name: {{sender}}
Recipient Company: {{company}}
Proposal Subject: {{subject}}{{value}}{{strengths}}

Write a concise, professional cover letter (3-4 paragraphs) that introduces the sender, references the proposal subject, highlights value, and closes with a clear call to action. The letter should feel personalized and compelling.

Return only the cover letter text, no subject line or extra commentary.