Some of my incoming emails are bounced

Question

Recently I have had parties send me emails which were bounced back to the sender. Some were zoom invites and others invoices. Many emails are still being recieved. I've reached out to Microsoft Support through chat but have not recieved a call back in the last 2 days. Any idea what could be the cause?

Answer 1

Hello,

Do you see any error code in the bounce message?

This issue is often caused by blocked senders, mail rules, or storage limits. In Outlook on the web, go to Settings, Mail, Junk email and remove any blocked entries. Then check Mail, Rules and disable rules that delete or reject messages. Also check Settings, Account, Storage to confirm your mailbox is not full. If needed, update your password to clear any account restriction.

Answer 2

The most common causes, based on similar Outlook.com scenarios, are:

1. Sender-side delivery failures
   • If senders get “delivery failed” reports, the issue can be on their side or their provider’s route to Outlook.com.
   • For transient errors like “Can’t connect to remote server/message expired” or “Connection timed out”, the problem often resolves by itself. The sender should wait a bit and resend the message.
   • If the error mentions the group (for example, messages to a distribution group), the sender should review and remove invalid addresses from that group.
   • If the error mentions being “blocked” or “listed in” a blacklist (Spamhaus, Spamcop, etc.), the sender’s mail system or domain is being treated as spam. In that case, the sender must contact their own email provider to get unblocked.
2. Outlook.com mailbox or account issues
   • If Outlook.com cannot receive any mail when storage is full, messages are bounced and are not recoverable. Check cloud storage and mailbox usage and free space if needed.
   • If only some messages are missing (like Zoom invites or invoices), check for client-side filtering:
     • In Outlook.com, verify the Other tab, Junk Email folder, and any filters or rules that might move or delete messages.
     • Make sure there is no rule redirecting or deleting new mail (for example, a misconfigured rule diverting mail to another folder or RSS feed, as seen in a similar case).
     • Check Junk Email settings and blocked senders; if a sender or their domain is blocked, remove it so their mail can arrive.
3. When only specific senders are affected
   • If most mail arrives but certain senders get bounces and there is no error visible in the mailbox, those senders should:
     • Review the exact error text in their bounce message.
     • Follow Outlook.com’s Sender Support guidance if the error indicates Outlook.com is rejecting the mail.

If the above checks do not reveal the cause and the problem persists only for specific senders, the next step is for those senders to work with their own mail provider using the bounce details, while Outlook.com settings (rules, junk, blocked senders, storage) are reviewed on the mailbox side.

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References:

• Can't send or receive email in Outlook.com
• Sent email in Outlook.com comes back "delivery failed"
• Where are my email messages or calendar events in Mail and Calendar for Windows 10?
• Stopped receiving emails on my account. - Microsoft Q&A