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A Dutch hardware store just sent out a newsletter with a `from` address that is actually their (accidentally public!) mailing list that forwards to all their customers. So, every single autoresponder message from any of their customers is getting forwarded back to all their customers, triggering more autoresponder messages. There's also ticketing systems replying with "your ticket has been filed" to each other, "this email address no longer exists" errors spamming back and forth, and so on.

Tomorrow morning, a lot of people are going to wake up with very full inboxes.