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What does it mean to have a message returned as “undeliverable”?

April 26, 2017mean message RETURNED undeliverable

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What does it mean to have a message returned as “undeliverable”?

1 Answer

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Sometimes when you send out a message, it might come back to you right away as undeliverable. This means that the address (or one of the addresses) the message you’re sending to was rejected by our servers as being an invalid address.