undeliverable
adjective
un·de·liv·er·able ˌən-di-ˈli-v(ə-)rə-bəl 
-dē-
: not capable of being delivered : not deliverable
undeliverable mail/email
an undeliverable parcel
a message returned as undeliverable
undeliverability
ˌən-di-ˌli-v(ə-)rə-ˈbi-lə-tē
noun -dē-
Example Sentences
Recent Examples on the Web The Times submitted questions to spokespeople at parent company Atria Senior Living by email, but the emails were returned as undeliverable. 
Gregory Yeestaff Writer, Los Angeles Times, 29 Aug. 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 If the potential winner cannot be contacted or the notification is returned as undeliverable within seven (7) days after the attempt, the prize may be forfeited, and an alternate winner may be selected at Sponsor’s discretion. Outside Online, 3 June 2022 All were sent back as undeliverable by the post office — which routinely forwards mail for a maximum of one year. Los Angeles Times, 19 May 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 In those cases, the CTC checks may have been undeliverable, or the direct deposits bounced from the bank where an account was closed, Ken Corbin, the IRS chief taxpayer experience officer, said Monday on a conference call with reporters. Aimee Picchi, CBS News, 25 Jan. 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 The government’s Independent Projects Authority in April 2021 declared Ajax to be undeliverable. David Axe, Forbes, 3 Nov. 2021 See More
Gregory Yeestaff Writer, Los Angeles Times, 29 Aug. 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 If the potential winner cannot be contacted or the notification is returned as undeliverable within seven (7) days after the attempt, the prize may be forfeited, and an alternate winner may be selected at Sponsor’s discretion. Outside Online, 3 June 2022 All were sent back as undeliverable by the post office — which routinely forwards mail for a maximum of one year. Los Angeles Times, 19 May 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 In those cases, the CTC checks may have been undeliverable, or the direct deposits bounced from the bank where an account was closed, Ken Corbin, the IRS chief taxpayer experience officer, said Monday on a conference call with reporters. Aimee Picchi, CBS News, 25 Jan. 2022 Sponsor is not responsible for electronic communications that are undeliverable as a result of any form of passive or active filtering of any kind. chicagotribune.com, 20 Dec. 2021 The government’s Independent Projects Authority in April 2021 declared Ajax to be undeliverable. David Axe, Forbes, 3 Nov. 2021 See More Word History
First Known Use
1843, in the meaning defined above