By default, any undelivered message is returned to the sender with an NDR and deleted from the queue.
What happens to emails that are not delivered?
While it seems obvious, it is easily overlooked and happens often. Even if it's spelled correctly, if the e-mail address does not exist, the e-mail cannot be delivered and you will usually receive a non-delivery notification. ... A non-delivery notification may be sent to your spam folder.
How do I find my undelivered email?
Undeliverable as Addressed Mail
- Submit a search request in the Missing Mail application, OR.
- Call your Consumer Affairs representative via 1-800-ASK-USPS (1-800-275-8777) and they can complete a search request on your behalf, OR.
- Visit your local USPS Post Office and have a search request submitted.