Sending, receiving, and organizing email in Outlook.com
Hello,
- What is the exact error message the sender receives when they email you?
Send a test email from another one of your accounts to the affected email address. Check whether you receive any bounce-back (non-delivery) error messages. If you receive an error in the outbox, please share the complete error message here.
Additionally, ensure you have enough mailbox storage space to send and receive emails.
With a Microsoft account, you get 5GB of OneDrive and 15GB of Outlook email storage. If you exceed any one of the limits, you won't be able to send or receive emails. To check if you have enough storage, sign in with your Microsoft account here -
https://outlook.live.com/mail/0/options/accounts-category/storage