[SOLVED] Outlook Not Sending Emails – Outlook 2016, 2013, 2010 & 2007

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  • Updated on June 7th, 2020

This blog gives details about Outlook not sending emails error and their solution to fix when Outlook 2016, 2013, 2010 & 2007 not sending emails. It also describes all the possible causes and workarounds to solve the problem arises on sending emails in Outlook. There are many possible reasons why Outlook wouldn’t send an email and I will cover the maximum possible reasons applicable to all the Outlook versions i.e. Outlook 2016, 2013, 2010, 2007 and other previous versions.

Microsoft Outlook is the most common email clients for professional as well as personal communication. But like other platforms, it also encounters some frequent bugs and errors that obstruct the functionality of users as well as the organization. One such problem arises when Outlook doesn’t send emails and emails stuck in Outbox. So, let’s dig out the reasons behind it.

Reasons that make the users cannot send emails from Outlook

We collected the following possible reasons after a lot of analysis and research and found many reasons for the issue of Outlook not sending emails. So, be prepared for the extensive troubleshooting of the error. Some of the reasons explained below:

  • The email was sent using Comcast account that a different outgoing server.
  • Email has a huge attachment that slows or halts the sending process.
  • Account password was recently changed.
  • Account not authenticated properly with the mail server.
  • An add-in marks the item as read when you view the Outbox.
  • Outlook server or mail server is offline.
  • Outlook has no default email account.
  • Another program is accessing the PST or OST data (Desktop Search, Lync, etc).
  • An antivirus program is currently scanning the outgoing email.
  • Corrupted Send and Receive settings.

Methods to solve the issue of Outlook not sending emails

Now, let’s work out for the solutions to the problem due to which users cannot send emails from Outlook.

Method 1: Ensure the availability of servers

The primary task that has to be done before going to other steps is to check the state of the mail server. You can check it by looking lower right-hand corner of the Outlook window. If it appears “Connected” or “Connected to Microsoft Exchange”, the server is not the reason for the problem.

But, if it appears “Working Offline”, you’ll have to open the Send / Receive tab and click on the Work Offline button to disable it. You might need to open the email and send it again. Also, ensure the availability of the internet.

Outlook not sending emails

Method 2: Delete the large attachments

Most of the email clients impose some size limit on the attachment. So, making attachments that is exceeding or touching the threshold size may make the Outlook not sending emails. Hence, check by removing attachments from at least one email and send it from Outbox. Always use download links for attachments larger than 10 MB. By doing this, you’ll avoid a lot of inconveniences.

Method 3: Sync the account password

Email providers have tightened their security over the past years. If someone repeatedly tries to enter your account information from the other part of the globe, they’ll lock your mail account automatically. You’ll have to either change the password or have to use some authentication steps.

Here’s a quick guide for this:

  • Open the Outlook and go to File > Account Settings > Account Settings.fix Outlook not sending emails
  • Click on the Email tab to expand it and select your email account. Then, click on Change.fix Outlook 2016 not sending emails
  • Enter the new password in the password box and click the checkbox of “Remember Password”.fix Outlook 2010 not sending emails

Method 4: Disable scanning from antivirus

Generally, the antivirus programs scan the emails and if any virus is found, they prevent it and keep in Outbox. Sometimes, these antiviruses conflict with Outlook and prevent Outlook to send emails from the Outbox until the virus is removed. In such situation, disable the antivirus add-ins so that you won’t get a problem of Outlook not sending emails.

Method 5: Repair your Outlook profile

There are various settings that govern the functionality of an Outlook profile. It includes all the accounts and personal details. If the email messages do not leave your Outbox and Outlook not sending emails, repairing your Outlook profile might be helpful in fixing the issue.

  • Launch Outlook and go to File > Account Settings > Account Settings.fix Outlook 2013 not sending emails
  • Select the Email tab to expand it and select your account. Once your profile is selected, choose Repair.Outlook 2013 not sending emails
  • Follow the next steps and restart Outlook at the end.

Method 6: Run Outlook in Safe Mode

You can start sending emails by launching Outlook in safe mode through predefined following steps:

  • Go through Start Button of Windows PC.
  • In the search box, type exe /safe.
  • Then press the “Enter” command.
Method 7: Using the Inbox Repair Tool

Outlook stores all the information such as messages, emails, contacts, events etc. in the form of Personal Storage Tables (PST) files. If Outlook PST is corrupted or Outlook data file cannot be accessed due to error, it hinders the other functionality of Outlook. So, repairing PST file might be helpful to prevent the problem by which users cannot send emails in Outlook. For doing this, Microsoft provides an inbuilt inbox repair tool (Scanpst.exe) with Outlook. Run the scanpst.exe to repair the corrupted .pst file to prevent the problem of Outlook not sending emails.

fix Outlook 2007 not sending emails

There are different locations of scanpst.exe in different versions of Outlook.

Method 08: Using a professional PST repair tool

Sometimes, there comes a situation when none of the above methods work. In that scenario, a professional Outlook PST Repair Tool will definitely be helpful. It is an authentic and reliable software that will help to send emails in Outlook.


All the major reasons and possible workarounds have been covered in the above blog. You can go through them and remove the issue in which Outlook not sending emails or you cannot send emails in Outlook. If all the methods fail, you can definitely go to professional Outlook PST Repair.

About The Author:

Adom Smith is a DataRecoveryHelp Technology Writer. He is a technology enthusiast with over 3 years of experience in Data Recovery, IoT, Artificial Intelligence, and Robotics. He enjoys researching and sharing DIY solutions as well as tips and tricks for resolving Windows technical issues.

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