Sending, receiving, and organizing email in Outlook.com
Some common Outlook.com issues can explain why emails from some senders (for example Gmail) arrive, but others (for example Yahoo) do not:
- Mailbox or cloud storage might be full
- If Microsoft cloud storage or mailbox is full, new messages are rejected and bounced back to the sender and cannot be recovered.
- Check storage usage and delete unnecessary mail (especially in Junk Email, Deleted Items, and large folders) until under quota.
- Account or sign-in issues
- If the account is temporarily blocked because of unusual sign-in activity, or if the password was recently changed and not updated on all devices, some mail flow or sync issues can occur.
- Use the Microsoft account sign-in helper if there are sign-in problems.
- Device or client sync issues
- If Outlook is used on multiple devices (PC, Mac, or mobile), one device may not be syncing correctly.
- Removing and re-adding the device partnership to the Outlook.com mailbox can fix sync issues.
- Sender-side problems / non-delivery Ask the Yahoo sender to check for non-delivery reports (NDRs). Common reasons include:
- Invalid email address (mistyped hotmail.com address)
- Recipient mailbox full
- Sender’s server issues
- Their message being blocked or treated as spam by servers on the way
- Safe senders / spam filtering
- Ensure the Yahoo sender address is added to Contacts and to the safe senders list in Outlook.com.
- Ask the sender to check if their messages are being rejected or marked as spam on their side.
If the problem continues, have the Yahoo sender forward any bounce or error message they receive (without exposing sensitive information) and check the reason code shown there.
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