Missing incoming mail or an uncertain send

An incoming message is missing#

1. Check the exact address and linked mailbox when the recipient is an alias.
2. Check Inbox, Spam, Archive and Trash, and clear view filters.
3. For a new domain, check receiving verification and MX at the active DNS provider.
4. Ask the sender to check for a bounce and retain the sending time and recipient address for diagnosis.

An outgoing message is uncertain#

For ordinary mail, check Sent and the reported outcome. For the website API, query the message ID with the same project key. accepted does not guarantee Inbox placement and unknown is not definite failure. Do not immediately submit the same content under a new key.

Useful evidence without exposing private data#

• Domain, time and timezone, and whether the issue affects all mail or one sender.
• State or error code, plus operation or API-message ID when available.
• Do not share passwords, keys, sign-in links or personal document contents.