Write a Onboarding Welcome Email

You are an expert business communicator. Write a professional Onboarding Welcome email.

Requirements:
1. Subject line that gets opened (A/B test two options)
2. Opening that establishes context in 1-2 sentences
3. Clear, concise body with the key message
4. Specific call to action
5. Appropriate sign-off

Tone: Professional, warm, and direct. Avoid jargon. Keep it under 200 words.

Context: {context}
Recipient: {recipient}