We all use email services on a regular basis to carry out personal as well as professional communication. Microsoft Outlook is one of the most trusted email service providers in the world. With billions of users worldwide, Outlook helps users to make sure that they execute their business communication smoothly. With Microsoft Outlook email services, you can send or receive emails, manage contact, schedule meetings, share calendars, and handle many other useful tasks. However, there are times when users encounter trouble in using Microsoft Outlook services. One of the most common problems faced by the users is Outlook not sending emails.

There could be many possible reasons due to which users may not be able to send emails using their Microsoft Outlook email account. In this guide, we are going to provide you with brief instructions on how you can fix Microsoft Outlook not sending email problems along with the reasons. So if you are having a hard time using the Microsoft Outlook email services, keep reading the post and proceed with easy guidelines provided to fix the problem.

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Why is my Outlook not sending emails?

There can be many reasons due to which ‘Microsoft Outlook not sending email errors may occur on your device. Before you proceed next with the troubleshooting guidelines, it is crucial for you to walk through the most common causes behind the problem. The most common reasons are.

  1. Huge attachments with emails halt the sending process.
  2. An email has been sent using a different outgoing server.
  3. Change account password.
  4. Account authentication error.
  5. The mail server for the Outlook server is offline.
  6. No default email account for Microsoft Outlook.
  7. Corrupted email.
  8. Antivirus program causing trouble.
  9. Some other programs are accessing the PST or OST data.
  10. Server error.

Now that you know about the culprits causing the emails not sending in Outlook error on your device, let’s proceed next with easy troubleshooting guidelines to fix the problem.

Check the server

The first and foremost thing you can do to fix Microsoft Outlook not sending email errors on your device is ‘check the mail server state’. If your email server is offline, you cannot send emails using Microsoft Outlook as all the emails will be retained in the outbox folder. Have a look at the lower right-hand corner of your Microsoft Outlook window. If it is showing the connection is connected to Microsoft Exchange status, then your server is online. But, if it is showing the ‘ working offline’ error, go to the’ send/ receive’ tab, click the work offline button.

You are supposed to open the emails from the Outbox and send it again to continue using the services. In case the device is showing disconnected status, you need to check the internet connection. 

Delete the large attachments

There is a limit on the maximum size of the email attachment. And, if you cross the limit to add attachments, pictures, videos to your email, you may not be able to send the message. Most of the email service providers allow up to 25 MB of attachment size to be sent. If the size exceeds the limit, it can show you Outlook not sending email errors on the device. Also, if you have a poor internet connection, it may take longer than usual to send the email, and your email messages are stuck in the outbox folder. So you have to check the size of the email attachment, and if it exceeds the limit, you need to delete it. For this, open the ‘Microsoft Outlook’ folder, right-click on the email and click on the delete button.

Check antivirus scan on outgoing email

If you have an antivirus program installed on your device, it may scan your email at regular intervals to make sure that everything is fine. If the antivirus programs can for anywhere is or Malware on your email, it will prevent it from leaving the Outbox until you remove the virus. In case you have recently received any virus alert, it is recommended to scan the email before sending it.

Synchronized account password

For better security, the email service clients have introduced many new features like two-factor authentication, location to access the email, and more. If some outsider tries to repeatedly access your email account from the other part of the globe, it will lock your email account automatically. Or, you may receive a prompt to change the password for your email account. Also, you may need to follow some authentication steps to fix the issue

In case you have recently changed the password for your email account and facing Outlook not sending email errors on the device, you can proceed with the steps below and change the password.

  1. Open your Microsoft Outlook account.
  2. Go to the ‘ file’ section.
  3. Click on the ‘ account settings.
  4. Now you are supposed to type the password in the ‘ password box’.
  5. Put a checkmark on the box pressing next to ‘ remember password’.
  6. Click on the ‘Next’ button.
  7. Click on the ‘finish’ button.

These tips will help you to fix this “Microsoft Outlook not sending emailerror on your device. If you are still unable to send the emails, proceed with the next troubleshooting step.

Repair the Microsoft Outlook program

Sometimes the users are unable to send the emails from their Microsoft Outlook account because the program is damaged. In such a case you need to repair the program to continue sending the emails. Microsoft Outlook is a complex program, so there can be numerous problems. With the help of the auto repair method, you can repair the Microsoft Outlook program, however, the process will require a couple of hours to be completed. Following are the steps you can follow to repair the Microsoft Outlook program.

  1. Close the Microsoft Outlook program on your computer.
  2. Right-click on the ‘start’ button.
  3. Choose the ‘ applications and features’ option.
  4. From the bottom, Tap on ‘Outlook entry’.
  5. From here, click on the modify option.
  6. Select the ‘repair’ option, and hit the ‘continue’ button.
  7. Proceed with onscreen guidelines to complete the task.

Run the inbox repair tool

All the messages are stored by Microsoft Outlook in the PST folder. If the information in the folder is corrupted, it can create trouble in Microsoft Outlook functionalities. You can repair the PST files using the inbox repair tool.

  1. Go to the ‘C:\ Program Files.
  2. Search for the ‘ scanPST.exe’.
  3. Press the browse button.
  4. Go to the outlook files\ documents to find the PST file.
  5. Click the start button to start the scanning process.
  6. If you see any error message appearing after the scanning, click on the ‘Repair’ button to fix the problem.

Send the emails in the safe mode

If you are still having trouble sending emails using your Microsoft Outlook account, we recommend you send the emails in safe mode to mitigate the issue. Sending emails in safe mode will help you to disable all the ads that may be causing you trouble.

Last but not the least

Final Words

We hope that these simple guidelines will help you to resolve Outlook not sending emails error on your device. All the provided troubleshooting steps are easy to follow, but, if you are still unable to send the emails using your Outlook account, it is recommended to contact the outlook support team immediately for expert assistance. The technical team can help you to figure out the best possible solution, so you can continue using the outlook email services without any hassle.


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