Emails from select senders not reaching my inbox

Question

I am not receiving emails from several senders. The emails are not in my Junk folder. The emails are not reaching my Inbox, so none of the account settings (message handling, rules, safe sender, etc) are involved.

I am working to get error data from these senders for reference.

How can I reach support to find out why emails from these legitimate senders are being blocked at the back end?

Thank you!

Answer 1

Hello

Can you tell me the sender's sending domain? For example, business.com?

Answer 2

For Outlook.com and Outlook on the web, when messages from specific legitimate senders never reach the Inbox or Junk folder, the most effective path is to:

1. Collect details from the senders
   • Ask each sender for the exact non-delivery report (NDR) or bounce message they receive when sending to the address.
   • Ensure the NDR includes SMTP error codes and any Microsoft-specific error text.
2. Verify nothing in the mailbox is diverting mail
   • Sign in to Outlook.com or Outlook on the web.
   • Check Settings > Mail > Rules to ensure there are no rules silently moving or deleting messages (similar to the hidden rule scenario where mail was diverted to RSS in another case).
   • Check Settings > Mail > Forwarding to ensure mail is not being forwarded without keeping a copy.
   • Check Settings > Mail > Junk email for:
     • Blocked senders and domains: confirm the senders’ addresses or domains are not listed.
     • Safe senders and domains: optionally add the affected senders here so that, once delivery is restored, their mail is prioritized to the Inbox.
3. Use Microsoft’s postmaster channel (sender-side support)
   • Since the problem is likely at the service/backend filtering level, the senders themselves should contact Microsoft via the postmaster channel.
   • Ask each affected sender to open a ticket with Microsoft using the guidance at postmaster.live.com (this is the official path for delivery and blocking issues).
   • They should provide:
     • Their sending IPs and domains
     • The full NDR text
     • Sample message headers if any messages are intermittently delivered
4. If messages are being misclassified rather than fully blocked
   • If any of the senders’ messages do arrive but in the wrong place, use:
     • Junk Email folder: mark legitimate messages as “Not junk” so Outlook.com can learn.
     • Inbox rules: as a workaround, create rules that look for consistent characteristics (subject keywords, from domain) and move them to Inbox or a specific folder.
5. If spam filtering seems broken more broadly
   • Temporarily change spam handling to reset behavior, as seen in a similar Outlook.com case:
     1. Go to Settings > Mail > Junk email.
     2. Set Incoming mail handling to Strict, save, sign out.
     3. Sign back in, set it back to Standard, save.
   • Allow a few hours for changes to propagate.
6. Escalation path
   • For consumer Outlook.com accounts, direct backend investigation (blocklist, filter, or transport issues) is handled only through Microsoft support and the postmaster route.
   • Since mailbox-level settings are not involved, the senders’ engagement with Microsoft via postmaster is essential; that is where Microsoft can see and adjust any backend blocks or reputation issues.

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References:

• Where are my email messages or calendar events in Mail and Calendar for Windows 10?
• Sender Screening
• Fixes or workarounds for recent issues on Outlook.com
• Receiving email from blocked senders in Outlook.com
• Filter junk email and spam in Outlook
• Outlook.com doesn't send any emails to junk folder - Microsoft Q&A
• I haven't received any email in Outlook for several months - Microsoft Q&A
• Stopped receiving emails on my account. - Microsoft Q&A
• my outlook email is not delivered - Microsoft Q&A
• MSN email issues - Microsoft Q&A