Outlook 365 not sending emails on Windows 10 – Troubleshooting Guide and Solutions

Sending and receiving emails is an essential feature of Microsoft Outlook 365, which is a popular email client used by millions of Windows 10 users. However, sometimes you may encounter issues with sending emails through Outlook 365 on your Windows 10 computer. These issues can be frustrating and may hinder your ability to communicate effectively.

If you are facing problems with sending emails through Outlook 365 on your Windows 10 system, don’t worry! This troubleshooting guide will help you identify and fix the issues causing email sending problems. By following the steps outlined in this guide, you can get your Outlook 365 email service up and running smoothly again.

Some common causes of email sending issues in Outlook 365 on Windows 10 include incorrect email settings, network connectivity problems, antivirus or firewall interference, and outdated software. It is important to diagnose the problem accurately in order to implement the correct solution. This guide will provide you with step-by-step instructions on how to troubleshoot and resolve these issues.

With this troubleshooting guide, you will be able to identify the root cause of your email sending problems and learn how to fix them effectively. Following the outlined steps will enable you to regain control of your Outlook 365 email service on your Windows 10 machine, ensuring that you can send and receive emails without any interruptions. So let’s get started and get your Outlook 365 email service back to its optimal performance!

Fixing Outlook 365 Email Sending Issues on Windows 10

If you are experiencing problems with sending emails on Outlook 365 on your Windows 10 computer, there are a few troubleshooting steps you can take to resolve the issue.

First, check your internet connection to ensure that you are connected and that your connection is stable. Poor or inconsistent internet connectivity can cause issues with sending emails in Outlook 365.

Next, make sure that you have entered the correct email settings in Outlook 365. Double-check the SMTP server settings, port number, and any authentication details required. Incorrect settings can prevent Outlook from sending emails.

If you find that Outlook 365 is not sending emails to any recipients, try sending a test email to yourself or another account to see if the issue is specific to certain recipients. It is also worth checking your spam or junk folder to ensure that the emails are not being incorrectly filtered.

If the issue persists, try disabling any antivirus or firewall software temporarily to see if they are interfering with Outlook’s email sending functionality. Sometimes, these security measures can block outgoing emails.

Another troubleshooting step you can take is to repair your Outlook 365 installation. Open the Control Panel, go to Programs and Features, and locate Microsoft Office. Select Change, then Repair. This will scan and fix any issues with the Outlook installation that may be causing the email sending problem.

Lastly, if none of the above steps solve the issue, you can try creating a new Outlook profile. This will create a fresh start and may resolve any underlying issues with the current profile. To do this, open the Control Panel, go to Mail, and click on Show Profiles. Create a new profile and set it as the default. You can then add your email account to the new profile and see if the email sending issue persists.

By following these troubleshooting steps, you should be able to resolve any Outlook 365 email sending issues on your Windows 10 computer.

Verify Internet Connection

If you are experiencing issues with sending emails in Outlook 365 on Windows 10, it is important to verify that your internet connection is working properly. Without a stable internet connection, Outlook may not be able to send emails.

To check your internet connection, follow these steps:

1. Make sure that your Wi-Fi or Ethernet connection is active.
2. Open a web browser and try to access a website. If the website loads without any problem, your internet connection is likely working.
3. If you are unable to access any websites or experience slow internet speed, try restarting your router or contacting your internet service provider for assistance.

Once you have confirmed that your internet connection is stable, try sending an email in Outlook 365 again. If the issue persists, you may need to troubleshoot other potential causes such as incorrect email settings or a problem with your Outlook installation.

By verifying your internet connection, you can ensure that Outlook 365 has the necessary network access to send emails successfully.

Check Outlook Server Status

If you are experiencing issues with sending emails in Outlook 365 on Windows 10, one of the first things you should check is the status of the Outlook servers. Sometimes, the problem may not be with your settings or configuration, but rather with the servers themselves.

To check the Outlook server status, follow these steps:

1. Open a web browser on your Windows 10 computer.
2. Go to the official Outlook website or search for “Outlook server status” in your preferred search engine.
3. Look for a page that provides real-time information on the status of the Outlook servers.
4. On this page, you should see a list of services and their respective statuses, such as “Online,” “Degraded performance,” or “Service outage.”
5. Check if there are any reported issues with the sending of emails. This information is usually highlighted or displayed prominently on the page.
6. If there are server issues reported, you may need to wait for Microsoft to resolve them. In such cases, there is little you can do until the servers are back online or the issues are resolved.
7. If the server status indicates that everything is functioning properly, the problem may lie elsewhere, and you will need to troubleshoot further.

By checking the Outlook server status, you can quickly determine if the issue with sending emails is due to a server problem. This step can save you time and frustration by providing clarity on the source of the issue.

Update Outlook 365

If you are facing issues with sending emails in Outlook 365 on Windows 10, one of the first troubleshooting steps you can try is to update the application. Ensuring that you have the latest version of Outlook 365 can help resolve any known bugs or compatibility issues that may be causing the problem.

To update Outlook 365, follow these steps:

1. Open Outlook 365.
2. Click on the “File” tab in the top left corner of the window.
3. In the sidebar that appears, click on “Office Account”.
4. Under the “Product Information” section, you will see a button labeled “Update Options”. Click on this button.
5. From the drop-down menu that appears, select “Update Now”.
6. Outlook 365 will now check for any available updates. If an update is found, it will be downloaded and installed automatically.
7. Once the update is complete, restart Outlook 365.

After updating Outlook 365, try sending emails again to see if the issue has been resolved. If you are still experiencing problems, you may need to try other troubleshooting steps or contact Microsoft support for further assistance.

Review Outlook Account Settings

If you are using Outlook 365 on Windows 10 and facing issues with sending emails, it is essential to review your Outlook account settings. Incorrect settings can prevent your emails from being sent successfully. Follow the steps below to review your account settings:

1. Open Outlook: Launch the Outlook application on your Windows 10 computer.
2. Click on “File”: In the upper left corner of the Outlook window, click on the “File” tab.
3. Select “Account Settings”: From the dropdown menu, select “Account Settings” and then choose “Account Settings” again.
4. Check account settings: In the Account Settings window, you will see a list of email accounts. Select the account you are having trouble with and click on the “Change” button.
5. Verify outgoing mail server: Ensure that the outgoing mail server (SMTP) settings are correct. The server address should be something like “smtp.office365.com”. If the server address is incorrect, update it accordingly.
6. Verify port number and SSL settings: The SMTP port number should be set to “587” and the SSL (encryption) option should be enabled. If the port number or SSL settings are different, make the necessary changes.
7. Double-check username and password: Confirm that the username and password entered for the account are correct. Incorrect login credentials can prevent your emails from being sent.
8. Save changes: Once you have reviewed and made any necessary changes to the account settings, click the “Next” and “Finish” buttons to save your changes.

After reviewing your Outlook account settings, try sending an email again to see if the issue has been resolved. If you are still experiencing problems with sending emails, further troubleshooting may be required.

Check SMTP Settings

If you are experiencing issues with sending emails in Outlook 365 on Windows 10, it is important to check your SMTP settings. SMTP stands for Simple Mail Transfer Protocol and it is responsible for sending outgoing emails from your email client to the recipients.

Step 1: Verify Server and Port Settings

First, make sure that you have entered the correct server address and port number for your outgoing mail server (SMTP). These settings can usually be found in your email account settings or provided by your email service provider. Double-check that there are no typos or missing characters in the server address or port number.

Server	Port	Encryption
smtp.example.com	587 (recommended) or 465	STARTTLS (recommended) or SSL/TLS

Step 2: Check Authentication Settings

In order to send emails, you need to provide the correct login credentials for authentication. Make sure that your username and password are entered correctly in the account settings. Some email providers may require you to use an app password or enable two-factor authentication for added security. Check with your email service provider for the specific authentication requirements.

Additionally, check if the “Outgoing server requires authentication” option is enabled in your email account settings. This option ensures that Outlook 365 uses the correct credentials when sending emails.

By following these steps and double-checking your SMTP settings, you can troubleshoot and resolve any email sending issues in Outlook 365 on Windows 10. Ensure that your server and port settings are accurate, and that your authentication settings are properly configured.

Disable Firewall and Antivirus

If you are experiencing issues with sending emails through Outlook 365 on Windows 10, it is possible that the firewall or antivirus software on your computer is blocking the outgoing email connection. Firewalls and antivirus programs are designed to protect your computer from threats, but they can sometimes interfere with legitimate email communications.

In order to troubleshoot this issue, you can try temporarily disabling your firewall and antivirus software. Keep in mind that disabling your firewall and antivirus software should only be done as a temporary troubleshooting step, and you should re-enable them once the issue is resolved.

To disable your firewall, you can go to the Windows Control Panel, select “System and Security,” and then click on “Windows Defender Firewall.” From there, you can choose to turn off the firewall temporarily.

Similarly, to disable your antivirus software, you can open the program’s interface and look for an option to temporarily disable or turn off the antivirus protection. The exact steps will vary depending on the antivirus program you are using.

After disabling your firewall and antivirus software, try sending an email through Outlook 365 again to see if the issue persists. If the emails are now being sent successfully, it is likely that the firewall or antivirus software was indeed causing the problem.

Once you have confirmed that the issue is resolved, remember to re-enable your firewall and antivirus software to ensure continued protection for your computer.

However, if the emails are still not being sent even with the firewall and antivirus software disabled, there may be other underlying issues that need to be addressed. In this case, it would be advisable to seek further assistance from technical support or IT professionals.

Clear Outbox Folder

If you are experiencing sending issues with your Outlook 365 emails on Windows 10, one possible cause could be that the emails are getting stuck in the Outbox folder. The Outbox folder is where emails are temporarily stored before they are sent.

To clear the Outbox folder in Outlook:

Step 1: Open Outlook

Launch the Outlook application on your Windows 10 computer.

Step 2: Go to the Outbox folder

In the left-hand menu, click on the “Outbox” folder to view the emails that are waiting to be sent.

Step 3: Delete or resend the stuck emails

If you see any emails in the Outbox folder, select them and either delete them or try resending them by clicking on the “Send” button again.

By clearing the Outbox folder, you may be able to resolve any issues related to sending emails in Outlook 365 on Windows 10. If the problem persists, further troubleshooting may be required.

Delete Suspicious Emails

If you are experiencing issues with sending emails from Outlook 365 on Windows 10, it is important to check for any suspicious emails in your mailbox. These suspicious emails can often interfere with the smooth functioning of Outlook and cause sending issues.

Identify Suspicious Emails

To identify suspicious emails, look for the following signs:

• Emails from unknown senders
• Emails with strange or misspelled subject lines
• Emails with unusual attachments
• Emails requesting sensitive information or passwords

Steps to Delete Suspicious Emails

Once you have identified any suspicious emails, follow these steps to delete them:

1. Open Outlook 365 on your Windows 10 computer.
2. Select the suspicious email or emails that you want to delete.
3. Right-click on the selected email(s) and choose “Delete” from the context menu.
4. If prompted, confirm the deletion by clicking “OK” or “Yes”.

By deleting suspicious emails, you can ensure that they do not interfere with the sending process in Outlook 365. It is always important to exercise caution when dealing with unknown or suspicious emails to protect your computer and data.

Repair Outlook Data Files

If you are using Outlook on Windows 10 and experiencing issues with sending emails, it is possible that your Outlook data files have become corrupted. Corrupted data files can cause various problems, including issues with sending emails.

To repair Outlook data files, you can follow these steps:

1. Close Outlook if it is open.
2. Click on the “Start” button in the bottom-left corner of your screen, then search for “Control Panel” and open it.
3. In the Control Panel, select “Mail (Microsoft Outlook 2016)” or a similar option depending on your version of Outlook.
4. Click on the “Data Files” button.
5. In the “Account Settings” window, select the Outlook data file that you want to repair.
6. Click on the “Settings” button.
7. In the “Outlook Data File” window, click on the “Compact Now” button.
8. Wait for the compacting process to complete. This process may take some time depending on the size of your data file.
9. Once the compacting process is finished, close all the windows and restart Outlook.
10. Try sending emails again to see if the issue has been resolved.

If repairing the Outlook data files did not resolve the issue, you may need to consider other troubleshooting steps such as checking your internet connection, updating Outlook to the latest version, or contacting your email provider for further assistance.

By following these steps, you should be able to repair your Outlook data files and resolve any issues with sending emails on Windows 10.

Remove and Re-add Email Account

If you are experiencing issues with sending emails through Outlook 365 on your Windows 10 computer, one solution is to remove and then re-add your email account. This can help refresh the connection between Outlook and your email provider, resolving any sending issues.

Here is a step-by-step guide on how to remove and re-add your email account in Outlook 365:

1. Open Outlook 365 on your Windows 10 computer.
2. Click on the “File” tab at the top left corner of the Outlook window.
3. In the “Info” section, click on “Account Settings” and then select “Account Settings” from the drop-down menu.
4. In the “Account Settings” window, select the email account that you want to remove.
5. Click on the “Remove” button.
6. A confirmation prompt will appear asking if you want to remove the email account. Click “Yes” to proceed.
7. Once the account is removed, close the “Account Settings” window.
8. To re-add your email account, click on the “File” tab again and select “Add Account” from the drop-down menu.
9. Follow the on-screen prompts to enter your email address and password.
10. Outlook will try to automatically configure your email account settings. If it is successful, your account will be added and you can start sending emails again.

By removing and re-adding your email account, you can troubleshoot any connection or configuration issues that may be preventing Outlook 365 from sending emails properly on your Windows 10 computer. Remember to double-check your email account settings and ensure that you have a stable internet connection before re-adding the account.

Run Outlook in Safe Mode

If you are encountering issues with Outlook 365 not sending emails on Windows 10, running Outlook in Safe Mode can help resolve the problem. Safe Mode allows you to start Outlook with basic settings and disables any add-ins or extensions that may be causing conflicts.

To run Outlook in Safe Mode:

1. Close Outlook if it is currently open.
2. Press the Windows key + R to open the Run dialog box.
3. Type “outlook.exe /safe” and press Enter.
4. Outlook will launch in Safe Mode.
5. Try sending emails to see if the issue is resolved.

If Outlook is able to send emails successfully in Safe Mode, it indicates that an add-in or extension is causing the problem. You can then try disabling or uninstalling these add-ins to resolve the issue.

Running Outlook in Safe Mode is a useful troubleshooting step for various Outlook issues and can often fix problems with email sending.

Remove Add-ins

If you are experiencing issues with sending emails in Outlook 365 on Windows 10, it could be caused by incompatible or corrupted add-ins. Add-ins are additional features or extensions that can be added to Outlook to enhance its functionality. However, some add-ins may conflict with the software and result in email sending problems.

To troubleshoot this issue, you can try removing any add-ins that you have installed in Outlook. Here’s how:

1. Open Outlook 365 on your Windows 10 computer.
2. Click on the “File” tab in the top left corner of the Outlook window.
3. In the left sidebar, click on “Options” to open the Outlook Options window.
4. In the Outlook Options window, click on “Add-ins” in the left sidebar.
5. You will see a list of add-ins that are currently installed in Outlook. Look for any add-ins that you suspect may be causing the email sending problem.
6. Select the add-in you want to remove and click on the “Remove” button.
7. Confirm the removal of the add-in by clicking “Yes” when prompted.
8. Repeat steps 5-7 for any other add-ins you want to remove.
9. Once you have removed the add-ins, close and restart Outlook.

After removing the add-ins, check if the issue with sending emails in Outlook 365 on Windows 10 is resolved. If the issue persists, you may need to consider other troubleshooting steps or seek further assistance.

Note: Removing add-ins from Outlook may disable certain features or functionalities that were provided by those add-ins. If you rely on any specific add-in for your work, make sure to research any known compatibility issues before removing it.

Manage Outlook Cache

Outlook 365 on Windows 10 stores a local copy of your emails and other data in its cache. This allows for quicker access to your emails and improves performance. However, issues with the cache can sometimes cause problems with sending emails. Therefore, managing the Outlook cache can be a helpful troubleshooting step.

To manage the Outlook cache, you can follow these steps:

1. Clear the Outlook cache

Clearing the Outlook cache can resolve any corrupted or outdated data that may be causing email sending issues. To clear the Outlook cache:

1. Open Outlook 365 on your Windows 10 computer.
2. Click on File in the toolbar at the top of the window.
3. Select Options from the left sidebar.
4. In the Options window, click on Advanced.
5. Scroll down to the Outlook Start and Exit section.
6. Click on the button labeled “Empty Auto-Complete List”.

2. Adjust the cache settings

You can also adjust the cache settings in Outlook to optimize performance and potentially resolve sending issues. To do this:

1. Open Outlook 365 on your Windows 10 computer.
2. Click on File in the toolbar at the top of the window.
3. Select Options from the left sidebar.
4. In the Options window, click on Advanced.
5. Scroll down to the Send and receive section.
6. Click on the Send/Receive button.
7. In the Send/Receive Groups window, select your email account.
8. Click on Edit.
9. In the Account Settings window, click on the tab labeled “Offline Settings”.
10. Adjust the caching options according to your preference and needs.
11. Click OK to save the changes.

By managing the Outlook cache in these ways, you can help ensure smooth email sending in Outlook 365 on Windows 10.

Disable Email Scanning Feature

If you are experiencing issues with sending emails in Outlook 365 on Windows 10, it might be due to the email scanning feature. This feature can sometimes interfere with the sending process and cause emails to not be sent properly. To fix this issue, you can try disabling the email scanning feature. Here’s how:

1. Open the Windows Security app by clicking on the Windows Start menu and searching for “Windows Security”.
2. In the Windows Security app, click on “Virus & threat protection” in the left sidebar.
3. Under the “Virus & threat protection settings” section, click on “Manage settings”.
4. Scroll down to the “Exclusions” section and click on “Add or remove exclusions”.
5. Click on “Add an exclusion”, then choose “Folder” from the drop-down menu.
6. Navigate to the folder where your Outlook emails are stored. This is usually located in the “C:Users[your username]AppDataLocalMicrosoftOutlook” directory.
7. Select the folder and click on “Open” to add it as an exclusion.
8. Restart Outlook and try sending emails again to see if the issue has been resolved.

Disabling the email scanning feature can help fix any conflicts between Windows 10 and Outlook that may be causing the sending issues. If you continue to experience problems, you may need to further troubleshoot your email settings or contact Microsoft support for assistance.

Run Windows Update

If you are facing issues with sending emails in Outlook 365 on Windows 10, it is highly recommended to run Windows Update to ensure that your operating system and Outlook are up to date. Windows updates often include important bug fixes and patches that can resolve compatibility issues and improve overall performance.

To run Windows Update on Windows 10, follow these steps:

1. Click on the “Start” button in the bottom left corner of your screen.
2. Go to “Settings” by clicking on the gear icon.
3. In the Settings window, click on “Update & Security”.
4. Click on “Windows Update” in the left sidebar.
5. Click on the “Check for updates” button.
6. Windows will now check for any available updates and install them.
7. Once the updates are installed, restart your computer if prompted.

After your computer restarts, open Outlook 365 and try sending emails again. Running Windows Update ensures that your operating system has the latest security and compatibility updates, which can help resolve any issues with sending emails in Outlook 365.

Contact Microsoft Support

If you have followed all the troubleshooting steps mentioned above and your Outlook 365 email is still not sending on Windows 10, it may be time to contact Microsoft Support for further assistance. Their team of experts is available to help you resolve any issues you may be experiencing with Outlook 365 on Windows 10.

To contact Microsoft Support, you can visit their official website and navigate to the Outlook support section. Here, you will find various support options, including a live chat, community forums, and a toll-free phone number that you can call for immediate assistance.

Troubleshooting Tips to Remember

Before contacting Microsoft Support, make sure you have the following information ready:

• Your Outlook 365 email address
• The version of Windows 10 you are using
• A detailed description of the issue you are facing

This will help the support team understand your problem more effectively and provide you with a quicker solution.

Stay Patient and Positive!

Remember, technical issues can be frustrating, but with the help of Microsoft Support, you can get your Outlook 365 email sending back on track. Stay patient, follow their guidance, and keep a positive mindset. Soon enough, you’ll be back to using Outlook 365 on Windows 10 without any issues.

Don’t let technical problems hold you back from using Outlook 365. Contact Microsoft Support today and get back to sending emails with ease!

Question-answer:

Why am I unable to send emails from Outlook 365 on Windows 10?

If you are unable to send emails from Outlook 365 on Windows 10, there could be several reasons. It could be due to incorrect email settings, network issues, or problems with your email server. You should check your email settings, make sure you have a stable internet connection, and contact your email service provider for assistance.

What should I do if Outlook 365 is not sending emails on Windows 10?

If Outlook 365 is not sending emails on Windows 10, you can try a few troubleshooting steps. Firstly, check your internet connection to ensure it is stable. Ensure that your email settings, including the SMTP server and port, are correctly configured. You can also try disabling any antivirus or firewall software temporarily to see if it is causing any issues. If the problem persists, contact your email service provider for further assistance.

Who should I contact for assistance if I am unable to send emails from Outlook 365 on Windows 10?

If you are unable to send emails from Outlook 365 on Windows 10, you should contact your email service provider for assistance. They will be able to help you troubleshoot the issue and provide specific instructions or settings to fix the problem. It is also a good idea to check any error messages or codes that may be displayed in Outlook, as these can provide additional information about the issue.

Why am I unable to send emails from Outlook 365 on Windows 10?

If you are unable to send emails from Outlook 365 on Windows 10, there could be a few different reasons for this issue. It could be due to incorrect email settings, issues with your internet connection, problems with the SMTP server, or issues with your Outlook profile. To fix the problem, you can try checking your email settings, ensuring you have a stable internet connection, troubleshooting the SMTP server, or creating a new Outlook profile.