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Q: 

How to safely identify a DSN (delivery status notification) message

I'm fetching emails from a POP3 server and I'd like to make a difference between a regular email and DSN (Delivery Status Notification) / NDR (Non-Delivery Report/Receipt) messages.

What is the best/safest way to identify those messages? Are there any particular message-headers I should be looking for?

Thanks in advance!

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