Forensic Email Header Analysis

I need a digital forensics analyst to perform a fixed-price analysis of five (5) forwarded emails. The task is to forensically examine the full headers of these emails to conclusively identify the original author's IP address and email.

Requirements:
- Analyze plain text format emails
- Determine original sender's IP and email

Ideal Skills and Experience:
- Expertise in digital forensics
- Experience with email header analysis
- Familiarity with plain text email formats

Looking for a detailed and accurate report.