Outlook Not Receiving Emails as Microsoft Fixes Delivery Error

Outlook not receiving emails? Microsoft has fixed a spam filter problem that caused some Outlook and Hotmail messages to bounce back

Some Outlook users may have missed emails over the past few days because of a problem with Microsoft's spam filters. The company confirmed that some messages sent to Outlook, Hotmail and Live accounts were rejected by its servers. They were returned to senders instead of reaching the people they were meant for.

Microsoft traced the problem to a change in its spam enforcement rules. The update blocked some genuine emails by mistake. The company has now reversed the change. Still, anyone who noticed Outlook not receiving emails during this period may want to check with people who tried to contact them.

Missing Emails Never Reached the Inbox

Checking the junk folder would not have helped affected users. The rejected messages were never delivered to their accounts.

Microsoft's servers sent the emails back to their original senders, who may have received a delivery failure notice. Recipients, on the other hand, had no way of knowing that someone had tried to email them.

The problem also affected people reporting Hotmail not receiving emails. Outlook.com, Hotmail.com and Live.com accounts were included in the incident. MSN addresses were also mentioned in reports.

This could have meant missed work updates, invoices or personal messages. Anyone who was waiting for an important email may need to ask the sender whether it was returned.

Microsoft Has Fixed the Problem

Some senders received error messages with codes such as 550 5.7.1 and 550 5.7.23. These messages indicated that Microsoft's servers had refused delivery.

Microsoft rolled back the faulty update and restored normal email delivery on November 9, 2026. Senders did not need to change their email settings.

If an expected email never arrived, contacting the sender is the best option. They can check their delivery notice and send the message again if necessary.

The reported issue mainly involved personal Microsoft email accounts. Microsoft 365 business mailboxes were not the focus of the incident.

Microsoft's email authentication guide explains how SPF, DKIM and DMARC help verify email senders and prevent fraudulent messages.

Frequently Asked Questions

1. Why were some Outlook emails not delivered?

Microsoft's spam filtering update mistakenly rejected some genuine emails.

2. Has Microsoft fixed the issue?

Yes. The company reversed the update and restored normal delivery on November 9, 2026.

3. Can users find the missing emails in spam?

No. The affected messages were rejected before reaching the recipient's account.

4. Which email services were affected?

The issue involved Outlook.com, Hotmail.com and Live.com accounts. MSN addresses were also mentioned.

5. What should users do about missing emails?

They should contact the sender and ask for the email to be sent again.