Outlook.com won't let me send an email

If you're having trouble sending messages in Outlook.com, try these solutions.

If you aren't receiving messages, see I didn't receive an email someone sent to my Outlook.com account.

Check the service status

If you're having problems with Outlook.com, check the service status. If the status isn't green, wait until the service is running normally and try again.

Your inbox is full

If your inbox is full, you won't be able to send or receive new messages. To make room in your inbox, try emptying your junk folder by right-clicking Junk Email > Delete all.

A screenshot of the Delete all option

You can also use Sweep to remove unwanted email from your inbox or archive folders. Sweep lets you automatically delete all incoming email from a particular sender, keep only the latest message from that sender, or delete email from that sender that's older than 10 days. Select a message you want to sweep, and select Sweep.

A screenshot of the Sweep button

Saving photos and documents to OneDrive is another good way to make room in your inbox. To learn how to save attachments to OneDrive, see Free up storage in Outlook.com.

You can’t send email from Windows Live Mail, a mobile device, or Outlook on your computer

Earlier this year we introduced the new Outlook.com, which helps you focus on what matters, collaborate effortlessly, and get more done. As part of the upgrade, we are also moving accounts to a more secure and reliable infrastructure.

Reconnect your Outlook.com account to Outlook on your computer or Outlook on your phone

You’ll need to reconnect your Outlook.com account to Outlookon your computer or Outlook on your phone to ensure the best experience and fix issues. For more information about how to reconnect your account, please see this article.

Use the Mail app on Windows

Windows Live Mail 2012 no longer connects to Outlook.com accounts. Windows Live Mail users will need to use a different app or use a web browser to visit www.outlook.com. The built-in Mail app on Windows is the recommended replacement for Windows Live Mail 2012, and is the most-used email application among Outlook.com users today. Read more about why Windows Live Mail 2012 will not connect to Outlook.com

You recently changed your password

If you changed your password for Outlook.com, you may need to change your email account settings in Outlook and in your mobile apps too.

The message or attachments are too large

If you've connected your Outlook.com account to Outlookon your computer or or Outlook on your phone and you try to send a message with an attachment that's larger than 25MB, Outlook won't send the message.

To fix the issue, go to your Outbox and then open the stuck email messages. Start with the oldest message first. If the message has an attachment that’s larger than 25MB, delete the attachment and either attach a smaller file or upload the file to OneDrive and then attach a link to the attachment. You can then try to send the message again.

To learn more about attaching files to messages in Outlook for Windows, see Attach a file to an email in Outlook for Windows.

Check the “To” address line

Make sure that the email addresses of the people you are trying to send to are formatted correctly. If you try to send a message to an incorrectly typed email address, an error message will appear.

For example, if you accidentally leave off ".com" from an email address, you will receive an error similar to this:

A screenshot of an address formatting error in Outlook.com.

You've exceeded the daily message limit

To help deter spammers, Outlook.com limits the number of messages that can be sent in one day. If you receive a message that you've reached the daily message limit, try the following:

  • Save your email as a draft and send it the next day.

  • Increase your message limits by adding security info to your account.

  • If the email was created on a mobile device, tap to close the message. You'll receive a prompt asking you if you want to save or delete the message. Select Save and then Sync. You can then to go Outlook.com on a computer, open the draft, and send it.

You have too many connected accounts

You can connect a maximum of 20 other email accounts to your Outlook.com account. If you’ve connected more than 20 accounts, you won’t be able to send or receive messages from any of your connected accounts. To resolve the issue, please remove some connected accounts so that the total number of connected accounts is 20 or fewer.

Your account might be blocked

If you can't send or receive email, your account might be temporarily blocked because we noticed some unusual sign-in activity. To learn how to unblock your account, see Unblock my Outlook.com account.

You've added too many recipients to one email

Outlook.com limits the number of recipients you can add to an email message. If you exceed the limit, an error message will let you know how many recipients you can add to your email. Remove some recipients and then try sending again.

Your content triggered junk email filters

Outlook.com blocks the sending of messages when the content looks like junk email to the Outlook.com junk filters. Occasionally, legitimate email can be marked as junk. If your message is blocked, try changing the content of your message and sending it again.

Increase your message sending limits

You can increase your sending limits by adding security info to your account. Go to your Microsoft account security page, select Update info, and add the following security info to your account:

Phone number

  1. Select Add security info.

  2. In the dialog box, enter your phone number.

  3. Select Next and follow the on-screen instructions.

Alternate email address

  1. Select Add security info.

  2. In the dialog box, select the arrow next to A phone number, and select An alternate email address.

  3. Enter an alternate email address.

  4. Select Next and follow the on-screen instructions.

Two-step verification

  1. Select Set up two-step verification.

  2. Enter your password, and select Sign in.

  3. Select Next and follow the on-screen instructions.

Insufficient permission

Information Rights Management (IRM) allows senders to specify access permissions for their email messages, which might include preventing messages from being forwarded, read, printed, or copied by unauthorized people. To learn more about this feature, see Introduction to IRM for email messages.

You're sending email from an older device that uses AUTH PLAIN

Outlook.com no longer supports AUTH PLAIN authentication. If you try to send messages from a device that uses AUTH PLAIN authentication, your messages won't send. For more information, see Outlook.com no longer supports AUTH PLAIN authentication.

Still need help?

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Related Topics

Free up storage in Outlook.com

I didn't receive an email someone sent to my Outlook.com account

Organize your Inbox with Archive, Sweep, and other tools in Outlook.com

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