Diagnose missing incoming email
Mailbox authentication does not prove SMTP accepts its domain.
Before you begin
Recipient, timestamp, sender bounce and intended local/remote routing.
Use the controls offered by your installed version and account permissions. This guide describes the workflow; it does not grant additional access.
Follow the steps
- Check authoritative MX and address records.
- Confirm mailbox existence and intended local mail.
- Have the administrator compare mail-domain registration and tenant ownership.
- Inspect Postfix rejection/delivery and mailbox quota.
- Send a new controlled message and verify IMAP receipt including Spam/Junk.
Check the result
A valid recipient's new message is accepted and reaches its inbox.
If something goes wrong
Do not register intentionally remote mail locally. Never weaken unauthorized-relay rejection to accept a legitimate hosted recipient.
Prepare useful details for support