How do you send an email from one of the alternative email address in a GroupWise user account?

Ie. A GW user account may have serveral email addresses:
Eg. (Preferred)

When you send, the email is sent from the preferred address.

Manually typing in the address in the "From" field doesn't work. And the only other option in the "From" field is selecting proxies.

I found this but don't really like their solution of adding POP/IMAP.

We're using GW 14.0.2 Build: 120664