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undeliverable [ˌʌndɪ'lɪvǝrǝbl] adj.
comp., MS onbestelbaar (Not able to be delivered to an intended recipient. If an e-mail message is undeliverable, it is returned to the sender with information added by the mail server explaining the problem; for example, the e-mail address may be incorrect, or the recipient's mailbox may be full)
undeliverable: 6 phrases in 2 subjects
Communications2
General4