I know we can do this in Thunderbird, but can anyone tell me if it's possible to configure Outlook to use a different return address when sending email?

Customers are used to using an email address (@domain1.com) and it's the one in their address books. Email policy has been changed (long story) and all email is now being sent from a different domain, not the same, but similar...for instance,  @domain2.com.

Can we tell Outlook to use the old return address (@domain1.com) when sending mail from the new (@domain2.com)?

Many thanks for any help you can give with this.