If you are using Outlook Client/Webmail/APP, you do not need to change any settings for the new email address (

If you are not using outlook as your email client, you need to modify the sender address at the email client.

Below are the steps for changing sender email address in Thunderbird:

  1. Open your Thunderbird, on the left-hand side, right click your email address and select settings.
  2. On account setting, your email address, modify it to
  3.  Click OK.