[MM3-users] address for email for owner

I just migrated my lists to mailman3 in docker today... YEAHHH!!!!!!!! but now my admins have to setup accounts and I noticed when they get the email to confirm it comes from

admnin@[XYZ.COM]. Where is this email set? how can I change it? it is set to an internal domain (not public) of ours, so it is getting flagged as spam in external email accounts

I looked in my docker. yaml and the MAILMAN_ADMIN_EMAIL=mailman3@[123.com}. which is where I would expect the request/confirmation email to come from.