Sending, receiving, and organizing email in Outlook.com
A temporary Outlook.com sending block can happen even before the first message is sent if the account is flagged for unusual activity, high-volume or repetitive verification attempts, terms-of-service concerns, or risk signals tied to the sign-in or location.
Use this recovery path:
- Start with the Outlook.com unblock flow: Sign-in Helper.
- If verification is blocked, try a different verification method already connected to the account, such as an alternate email instead of SMS.
- Try a different network, such as switching between Wi‑Fi and cellular.
- Stop repeated attempts. Excessive retries can extend the block.
- Wait at least 24 hours. If the block remains, wait longer if possible, up to 1 week.
- If the account still cannot be unblocked by security code or password change, use the Microsoft sign-in recovery path from the Outlook.com unblock article.
- If self-help does not resolve it, use Outlook.com support from the “Still need help?” option, or the Microsoft account support path.
Also check whether the mailbox or OneDrive storage is full. If either is full, Outlook.com cannot send or receive email.
For sending limits, Outlook.com does enforce daily recipient limits, and limits can vary based on usage history. New accounts can have a lower temporary quota until credibility is established in the system.