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1. Change the default email account in Outlook.

   1. Click File > Account Settings > Account Settings.
      

      

   2. Select the account you want to send from and click ‘Set as Default’. Click Close.
      

      

2. Set Outlook to always use the default account to send new messages.

   1. Click File > Options.

   2. On the left click Mail.

   3. Scroll down to the 'Send messages' section.

   4. Enable “Always use the default account when composing new messages'.
      

3. Perform the mail merge. It should now be sent from the other account.
   

4. Revert these changes when you are done in order to reset your own account as the default.