10 lines
356 B
Text
10 lines
356 B
Text
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From: Sender Verification <verify@example.net>
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To: sender@example.com
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Subject: Sender verification required
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Date: Tue, 02 Jun 2026 10:09:00 +0000
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Message-ID: <challenge-response@example.net>
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Content-Type: text/plain; charset=utf-8
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This is a challenge-response message. Please verify yourself before your message
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can be delivered to challenge@example.com.
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