Hi.  Hope you are having a wonderful day!  This is an outlook preference that will need to be adjusted if you get a new machine or similar - but once you set it, it will retain that preference.


  1. Open Outlook and then open a blank email.
  2. Select the Options tab. The Options tab displays.

    FromButton

  3. Select the From button located in the Show Fields section of the toolbar. The drop-down menu displays.

    FromDropDown

  4. The drop-down menu displays two options: your own email address and a Other E-mail Address option. Select the Other E-mail Address option. The Send from Other E-mail Address screen displays.

    OtherEmailAddress

  5. The Send from Other E-mail Address screen provides the ability to select the email address from which you want this email to be sent. Select the From… button. The Choose Sender screen displays.

    SendFromOther

  6. On the Choose Sender screen, select the Address Book drop-down menu. Then, select the Global Address Listfrom the drop-down menu choices.

    SelectGAL

  7. In the Search field, at the top of the Choose Sender screen, begin typing the email address from which you want to send the email.
  8. Locate the email address and select it with your cursor. Then, select the OK button.

    SendOK

  9. The Choose Sender screen closes and the Send from Other E-mail Address screen is displayed again. The email address that your chose as the From address is now displayed on the Send from Other E-mail Address screen.

    SendFrom2

  10. Select the OK button. The blank email displays the new From address.

    BlankEmail

Repeat these steps as is necessary.



Reference:  https://dtsdocs.usc.edu/changing-the-from-address-in-a-new-email/