Recently, I ran a rename domain, and then set up a domain alias from the old domain to the new domain. Now (some?) webmail users have the following in their primary account settings:

Messages sent from this account have the following settings:
From: Choose the name that appears in the from field of the email messages
[Name ] and then there is a dropdown with user@olddomain.com and user@newdomain.com

Is there a way for me to set a global preference that would change everyone's send mail from address to user@newdomain.com?

Thanks