If someone tells you they emailed you and you never received it — with no bounce-back to them and nothing showing up in your Junk or Trash folders — here's how to check what's going on. (If your domain itself shows a missing-MX warning or replies specifically aren't arriving, see My domain shows "missing MX records" or I'm not getting replies instead.)
First, confirm it's not a delivery timing issue
Give it a few minutes. Most mail arrives within seconds, but occasional delays of a minute or two can happen.
Check Junk/Spam and Trash in the mailbox, not just the inbox.
Ask the sender to check their own Sent folder and confirm they didn't get a bounce-back (a "delivery failed" notice). If they got a bounce, the issue is on their end — the message never reached us in the first place.
If you're reading the mailbox in an email app (the supported ones are BlueMail and Outlook — Gmail/Google can't be connected), make sure it's fully synced — refresh or restart the app before assuming a message is missing.
If the missing message was an out-of-office reply: Maildoso does not filter these out. OOO replies are delivered to the individual mailbox like any other incoming email — they just aren't forwarded to the Master Inbox (see Forwarding Addresses / Master Inbox), so check the mailbox itself in your email app or over IMAP. That said, many customers notice they get fewer OOO replies on Maildoso mailboxes than on Google Workspace, while the number of human replies stays the same or is higher. This happens across all accounts, not on specific mailboxes or servers, and we don't yet know the reason. A low OOO count on its own doesn't mean mail is being lost: if human replies are arriving normally, your mailboxes are receiving mail correctly.
If the missing message was a bounce or delivery status notification (DSN), this is expected: bounce notifications aren't returned to the mailbox, and there's no bounce feed in the dashboard, API or webhook — see Why was my email accepted but never delivered, with no bounce?
If the message still isn't there
Sometimes a message is confirmed as received by our mail servers, but doesn't make it into the mailbox, with no error generated on either side. This is different from a normal bounce or spam-filtering case, and it isn't something you can fix from the dashboard — it needs to be looked at on our end. If specifically it's copies forwarded to your Master Inbox that are missing rather than the mailbox itself, see Forwarding Addresses / Master Inbox.
To help us investigate quickly, please contact support with:
The affected mailbox address(es)
The sender's address and the approximate date/time the email was sent
The subject line (or a unique word in it) so we can trace it
Whether this happened once or repeatedly, and roughly what share of your incoming mail seems affected
A note on testing this yourself
If you want to test delivery, send a handful of separate test emails (not identical copies) from an external account to your mailbox, spaced a few minutes apart, and check each one individually over IMAP or in the dashboard. This gives our team much more to work with than a single missing email.
If you're still stuck after checking the above, contact support and we'll take a look at your specific case.