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How To Set Up OAuth In MailWasher

Microsoft recently introduced a new method of authentication (known as OAuth) for users who are accessing Outlook.com/Hotmail accounts via third-party applications.

Microsoft is in the process of deprecating all standard methods of authentication, including passwords and app passwords, and OAuth will eventually (by 16th September 2024) become the only accepted method for signing into these accounts via third-party apps.



MailWasher & OAuth

MailWasher is an email and spam manager for Windows that’s available either in a free version (limited to a single email account) or Pro version which handles unlimited email accounts and includes other additional features. It’s one of my must-have and most often recommended programs: MailWasher Feature Comparison Chart

In this guide I’ll show you how to set up OAuth in MailWasher:

Setting Up OAuth In MailWasher

  • First off you need to delete the old Outlook.com/Hotmail account
  • In MailWasher go to Settings > Accounts, highlight the appropriate account, and then click the Remove Account button:

MailWasher Delete Account

  • Now click the Add Email Account button
  • Under the “General” tab, type in an account description – something that identifies the account for you, such as Outlook or Hotmail and then type in the email address
  • Open the “Incoming” tab and make sure the Server Type is set to IMAP
  • Now click the Sign in with Microsoft button

MailWasher Incoming Settings

  • Follow the prompts to sign into your account
  • Once signed in you should receive a “permissions” form. Click Accept

Microsoft Permission Form

  • Now click the Save button to save your settings and it will auto-move to the “Outgoing” tab which should be automatically populated

MailWasher Outgoing Tab Settings

  • Lastly, on to the “IMAP” tab where you can choose which folders MailWasher will check for spam – this will usually be set to only the Inbox by default


One final note: Whenever changing MailWasher’s settings, remember to click that Save button when finished, otherwise your changes won’t stick.

5 thoughts on “How To Set Up OAuth In MailWasher”

  1. Thanks for the clear instructions Jim. Corrected my Outgoing Secure Connection from the default of None to TLS, Mindblower!

  2. Frank Siebert

    Magic and a very grateful thank you. Mailwasher Pro has been driving me nuts over the last month or so. The ‘Check Mail’ scan would error out, then an hour later it would work perfectly without changing any settings. Will be interesting to see, over the next week or so, if setting up the authorisation to ‘OAuth’ solves the problem.

      1. Frank Siebert

        Update – Two weeks after implementing your OAuth fix Mailwasher Pro has been working great, and hasn’t missed a beat. Thanks again Jim.

  3. Leave it to MS to make things as complicated as possible. Thank you for the step by step instructions.

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