Word couldn't send mail because of mapi failure login failure

A frustrating error!

The error message "couldn't send mail because of MAPI failure login failure" typically indicates that there's an issue with your email account's login credentials or the Microsoft Exchange server's configuration.

Here are some potential solutions to help you resolve the issue:

  1. Check your email account credentials: Ensure that your email account login credentials (username and password) are correct and up-to-date. Try logging in to your email account using a web browser to verify that your credentials are valid.
  2. Verify MAPI settings: MAPI (Messaging Application Programming Interface) is a protocol used by Microsoft Outlook to communicate with email servers. Check your Outlook settings to ensure that the MAPI settings are correct. You can do this by following these steps:
    • Open Outlook and go to File > Options > Advanced.
    • Click on the "Send/Receive" tab.
    • Ensure that the "Use MAPI" option is selected.
  3. Check Exchange server settings: If you're using an Exchange server, ensure that your account is properly configured and that the server is available. You can try restarting your Exchange server or contacting your Exchange administrator for assistance.
  4. Disable and re-enable MAPI: Sometimes, disabling and re-enabling MAPI can resolve the issue. To do this:
    • Open Outlook and go to File > Options > Advanced.
    • Click on the "Send/Receive" tab.
    • Uncheck the "Use MAPI" option.
    • Wait for a few seconds and then re-check the option.
  5. Check for Outlook updates: Ensure that you're running the latest version of Outlook. You can check for updates by going to File > Office Account > Update Options > Update Now.
  6. Reset Outlook settings: If none of the above steps work, you can try resetting Outlook's settings to their default values. To do this:
    • Open Outlook and go to File > Options > Advanced.
    • Click on the "Reset" button at the bottom of the window.
    • Confirm that you want to reset the settings.
  7. Contact your email administrator: If none of the above steps resolve the issue, it's possible that there's a problem with your email account or the Exchange server. Contact your email administrator or IT department for further assistance.

I hope these steps help you resolve the issue and get your email sending again!