Word couldn’t send mail because of MAPI failure: “Unspecified error”

Word couldn’t send mail because of MAPI failure: “Unspecified error”

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Word couldn't send mail because of MAPI failure

How to fix Word couldn't send mail because of MAPI failure: “Unspecified error”

When a user tries to share a document as an attachment by email in Microsoft Word or attempts a mail merge then he may receive the errors: Word couldn’t send mail because of MAPI failure: “Unspecified error”
“Word couldn’t send mail because of MAPI failure” prompts because the email client is unable to handle the request due to incorrectly installed, missing, or corrupted files.

Error Message

Word couldn’t send mail because of MAPI failure: “Unspecified error”. This error can occur if you attempt to send a Word document as an e-mail attachment in Word and the MAPI session was closed and Word is no longer able to connect to that MAPI session. It can also occur if there is a problem with the fax configuration. To correct a MAPI related error: restart the MAPI e-mail program (for example,Outlook) or save and close the document, and then restart Word after restarting your MAPI e-mail application. Word will establish a new MAPI session, allowing the document to be sent. To correct a problem with the fax configuration, review the configuration settings for your fax software and make the appropriate changes.

You might want to read about Either there is no default mail client or the current mail client cannot fulfill the messaging request.

Causes of Word couldn't send mail because of MAPI failure: “Unspecified error”

Below mentioned are the various potential triggers that can cause Word couldn’t send mail because of MAPI failure: “Unspecified error”

  • Unable to identify the default email client
  • Add ons or Extensions causing the issue
  • MS Office was installed after the other application.
  • Corrupt Office installation

Resolution of Word couldn't send mail because of MAPI failure: “Unspecified error”

We have made a list of resolutions which we can try to fix the Error “Word couldn’t send mail because of MAPI failure: “Unspecified error””. We have listed the solutions in order to resolve the error.
Performing the below-mentioned solutions and workaround help us to resolve the error “Word couldn’t send mail because of MAPI failure: “Unspecified error””.

  • Set Default Email Client
  • Messaging Application Program Interface (MSMapi) File Updation
  • Disable Add-ins
  • Increase the Outlook Attachment Size Limit
  • Repair Office installation

1. Set Outlook As Default Email Client

  • Go to Start and click on Control Panel or Press Windows+R keys to open the Run box. Type “control” into the “Open” field, and then hit Enter or click on Ok to launch Control Panel
  • Choose Default Programs from the Control panel.
  • Click on Set your Default programs option.
  • Select Microsoft Outlook from the drop-down menu.
  • Click on Set this program as default to set Outlook as a default mail application.

If Microsoft Outlook is already a default email client, then there is some other reason causing the error Word couldn’t send mail because of MAPI failure.

Set Outlook As Default Email Client

2. Messaging Application Program Interface (MSMapi) File Updation

MSMAPI files are used to describe message services and their service providers and forms. If it used by another program or service then it may cause the error “Word couldn’t send mail because of MAPI failure”.

  • Navigate to C:\Program Files\Common Files\System\MSMAPI\<LocaleID>
    • (LocaleID is 1033 for English versions)
  • Locate and Rename MSMAPI32.dll to MSMAPI32.old.

Now check if the issue still exists.

MSMAPI32.dll

3. Disable Third Party Add-ins

Starting Outlook in Safe Mode can let you safely use it while it has encountered problems. This is helpful when you can’t open a file in normal mode because the application is crashing or there is an extension or add-in causing a problem on startup.

In safe mode, the Outllok may not open with the options provided by addins but can perform basic operations.

  • Find the shortcut icon of Outlook.
  • Press and hold the CTRL key and double-click the Outlook icon shortcut.
  • Click Yes on the prompt to start the application in Safe Mode. Or Press Windows+R keys to open the Run box. Type “outlook/safe” into the “Open” field, and then hit Enter or click on Ok to launch Outlook in Safe mode.
  • Once Outlook is open click on File > Manage Add-ins.
  • Under Manage add-ins, in the Turned on column, uncheck the box for the add-in you want to turn off.

If Outlook fails to open in Safe Mode, you may be required to reinstall the application from a reliable resource.

Manage Add-ins Outlook
COM Add-ins

4. Increase Outlook Attachment Size Limit

If you are attempting to send an email with attachment more than 20MB, then you also might get the error “Word couldn’t send mail because of MAPI failure”. By default, Outlook does not send emails with attachments that exceed 20 MB, but many mail servers allow 25 MB or larger attachments. If your email server allows larger attachments, configure Outlook to send emails larger than 20 MB.

  • Press Windows Key + R to open Run command, type regedit in the open field, and click Ok.
  • Navigate the registry tree and go to the entry corresponding to your Outlook version:
    • Outlook 2019 and 2016: HKEY_CURRENT_USER\­Software\­Microsoft\­Office\­16.0\­Outlook\­Preferences
    • Outlook 2013: HKEY_CURRENT_USER\­Software\­Microsoft\­Office\­15.0\­Outlook\Preferences
    • Outlook 2010: HKEY_CURRENT_USER\­Software\­Microsoft\­Office\­14.0\­Outlook\Preferences
  • Double-click the MaximumAttachmentSize value.
    • Note: If you don’t see MaximumAttachmentSize, add a registry key and value. Go to Edit, select New > DWORD Value, enter MaximumAttachmentSize, and press Enter.
  • In the Value data text box, enter the desired attachment size in KB(KiloByte).
  • Select OK and Close the Registry Editor.
regedit
MaximumAttachmentSize

5. Repair Office installation

If you have start receiving the error message “Word couldn’t send mail because of MAPI failure” after the installation of an Office application, try to fix the problem by repairing the Office installation.

  • Go to Start and click on Control Panel.
  • From Category view, under Programs, click on Uninstall a program. or Press Windows+R keys to open the Run box. Type “appwiz.cpl” into the “Open” field, and then hit Enter or click on Ok to launch Programs and Features.
  • Select the Office product you want to repair, and then click Change.
  • Depending if your copy of Office is Click-to-run or an MSI-based install, do the following for your Office installation type:
    • Click-to-Run installation type: In How would you like to repair your Office Programs, select Quick Repair to detect and replace corrupted files and then select Repair.
    • MSI-based installation type: In Change your installation, select Repair and then click Continue.
  • Follow the remaining instructions on the screen to complete the repair.
Repair Office installation

Frequently Asked Questions

  1. What is MAPI failure?

    MAPI failure is caused by the email client who is unable to handle the request due to incorrectly installed, missing, or corrupted files.
  2. How to set the default email client?

    Click on Start > Control Panel. Select Default Programs from the Control panel. Click on Set your Default programs option. Select the Mail client that you want to set as default from the drop-down menu.
  3. Is there an attachment size limit in Outlook?

    Yes, Outlook limits the size of files you can send. By default, Outlook does not send emails with attachments that exceed 20 MB but If your email server allows larger attachments, you can configure Outlook to send emails larger than 20 MB.

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