From: sender@example.com
To: recipient@example.com
Subject: Minimal email
Date: Wed, 22 Jan 2025 08:00:00 +0100

This email has only the essential headers:
- From (required by RFC 5322)
- To (required)
- Subject (recommended)
- Date (required by RFC 5322)

The blank line above separates headers from the body.
