How to set your alias as the default email address in Outlook

• Note; this method has been tested when using the Google Workspace Sync tool to sync Google with Outlook.
• Go to Options, then the ". . ." menu. 

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• Select the "From" field. This allows you to see the "From" dropdown when you are composing an email.

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• When you compose an email, select the "From" dropdown.

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• Add your alias address.
  
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• Note that you may have to close and reopen Outlook for it to select your new alias email address as the default.