So, we have a default policy that's being applied to all of our users but now that we are about to migrate those mailboxes to O365 i have realized that they don't have the proxy smtp address of domain.mail.onmicrosoft.com stamped.
Like I have mentioned that we do have a default policy with the following email address format:
SMTP @domain.com
smtp alias@domain.mail.onmicrosoft.com
so, why is this the case for 200 users and not the other 3000 users?
Thanks,

