Ndr Spam Block

• Ndr spam: uses a faked standard email non-delivery report (ndr) that a recipient will think is genuine, tricking them into opening an attachment that is spam.
• Spammers can send such an ndr directly or make a legitimate server send it for them, adding to its credibility.
• Ndr spam uses a faked standard email non-delivery report (ndr) that a recipient will think is genuine, tricking them into opening an attachment that is spam.

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