To help protect Microsoft Outlook customers from fraud or abuse, we sometimes block accounts from sending email when we notice unusual activity in the account. Here's what you can do to fix the problem and avoid getting this error in the future.
Go to the Add a phone page to verify your account with a mobile phone number.
If you can't verify your account with a mobile phone number, contact support for help.
Check your contacts and recipients lists to make sure that you're only sending messages to people who want to receive them.
Reduce the number of messages that you send to large groups of people so they're less likely to think your messages are unwanted email.
Limit the number of chain letters, email jokes, and other messages that you send to help people recognize your email as wanted. This also makes it more likely that your message will be allowed past your recipients' junk email filters.
Check all the contacts in your address book to make sure that the accounts are still active.
If you request that we send a code to your mobile phone, keep in mind that text message delivery isn't available in all countries or regions, or from all providers.
Text message delivery is subject to network delays, so it might take a few minutes to receive your code. If you've waited more than 15 minutes and haven't received the code, try requesting another code.
To prevent abuse of Outlook, we limit the number of times you can request a code each day. If you've reached the limit, you'll need to wait 24 hours before you can request a new code.
Simple instructions for common tasks.Outlook.com basics
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