Full Fix: Too many messages sent Outlook error

By: Milan Stanojevic
5 minute read

Outlook is a great email client, but many users reported Too many messages sent error. This problem can prevent you from sending new emails, and in this article we’ll show you how to fix this problem.

Too many messages sent error in Outlook, how to fix it?


  1. Start Outlook in Safe Mode
  2. Check your antivirus
  3. Check your DHCP settings
  4. Reinstall Outlook
  5. Use webmail
  6. Try a different email client
  7. Delete and add your email account again
  8. Disable Outgoing server requires authentication
  9. Contact your ISP

Solution 1 – Start Outlook in Safe Mode

Sometimes your Outlook configuration might not be correct, and that can lead to Too many messages sent Outlook error. To fix this problem, users are suggesting to start Outlook in safe mode.

Just like Safe Mode in Windows, Outlook has its own safe mode that allows you to start it with default settings. To start Outlook in Safe Mode, you just need to do the following:

  1. Press Windows Key + R and enter Outlook /safe. Now press Enter or click OK.
    outlook error too many messages sent
  2. When a new window appears, click OK to continue.

Outlook will now start in safe mode with default settings and add-ins.

If you want a more straightforward way to start Outlook in safe mode, you just need to do the following:

  1. Locate Outlook shortcut on your PC.
  2. Press and hold the Ctrl key and double-click the shortcut. After doing that, the Outlook will start in safe mode.

After Outlook starts, check if the problem is still there. If the issue doesn’t appear anymore, you might have to disable certain settings or add-ins in order to fix the problem permanently.


Solution 2 – Check your antivirus

outlook error too many messages sent

In some cases, Too many messages sent Outlook error can appear due to your antivirus. Having a good antivirus is important, but many antivirus tools can interfere with your system and cause this and many other errors to occur.

To fix this problem, it’s advised that you disable certain antivirus features or even your antivirus altogether. If that doesn’t work, the next step would be to uninstall your antivirus. Bear in mind that removing a third-party antivirus won’t leave your computer vulnerable thanks to the Windows Defender.

If removing the antivirus software solves the issue, you should consider switching to a different antivirus solution. There are many great antivirus tools on the market, but if you want maximum protection that won’t interfere with your system, we suggest that you try out Bitdefender.


Solution 3 – Check your DHCP settings

In case you don’t know, DHCP feature is in charge of assigning an IP address to your device. Sometimes your IP address might be blocked, and that will cause Too many messages sent Outlook error to appear.

To fix this problem, you need to change your DHCP settings and force the router to assign a new IP address to you. This is a slightly advanced procedure, and in order to perform it properly, be sure to check your router’s instruction manual for detailed information.


Solution 4 – Reinstall Outlook

In some cases, a corrupted Outlook installation can cause this issue to occur. To fix it, it’s advised that you reinstall Outlook. There are several ways to that, but the most effective method is to use uninstaller software.

In case you’re not familiar, uninstaller software is a special application that can remove any application from your PC. In addition to removing the application, the uninstaller software will also remove all files and registry entries associated with the problematic application.

By using uninstaller software such as IOBit Uninstaller, you’ll completely remove Outlook and all its files. After doing that, reinstall Outlook and check if the issue is still there.


Solution 5 – Use webmail

If you keep getting Too many messages sent error in Outlook, you might want to try using a webmail instead of a dedicated client. Webmail has its advantages over an email client, and one of the biggest benefits is the lack of errors.

While using a web client, you can only experience issues if there’s a problem with your ISP or mail provider. Since there’s no client, you won’t see Too many messages sent or any other client-related error.

This is a decent workaround until you manage to fix the core problem, so if you’re having issues with Outlook, be sure to try this solution.


Solution 6 – Try a different email client

outlook error too many messages sent

Sometimes Too many messages sent Outlook error can only appear in Outlook and not in other email clients. If using webmail isn’t for you, you can always try switching to a different email client.

There are many great email clients on the market, such as Thunderbird, but if you want a proper Outlook replacement, we strongly suggest that you try out eM Client.

If the issue still appears, even after switching to a new email client, it’s rather likely that your ISP is causing this problem.


Solution 7 – Delete and add your email account again

According to users, sometimes Too many messages sent error can appear due to issues with your email account. To fix this problem, it’s advised that you delete your email account and add it again.

We don’t know if this solution works, but many BT users reported that this method solved the issue for them, so you might want to try it out.


Solution 8 – Disable Outgoing server requires authentication

Sometimes certain Outlook settings can cause Too many messages sent error to appear. To fix this problem, you just need to disable a single option in Outlook. This is quite simple to do, and you can do it by following these steps:

  1. Open Outlook and go to File > Info > Account Settings.
  2. Select your email account from the list and click the Change button.
  3. Now click the More Settings button in the bottom-right corner.
  4. Go to the Outgoing server tab and uncheck Outgoing server requires authentication option.

After doing that, save changes and check if that solves your problem. Many users reported that this solution fixed the issue for them, so we strongly suggest that you try it out.


Solution 9 – Contact your ISP

In some rare cases, the cause for Too many messages sent might be your ISP. Your provider monitors your Internet activity, and sometimes your account might be flagged due to suspicious behavior.

Several users reported that issues with their ISP caused this problem to occur, but after contacting the ISP, the issue was quickly resolved.

Too many messages sent message can prevent you from sending emails from your PC, but we hope that you managed to solve this issue by using one of our solutions.

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