I host several domains and I have users who want to use personas that are basically wild-cards. For example, a user might want to be able to dynamically send/receive emails as (email@example.com, or firstname.lastname@example.org, email@example.com, etc). This is easily done with a catch-all account and setting "Allow sending email from any address."
But, I'd like to limit them to any address within their domain. I don't want users sending mail as users from another domain, or from domains that I do not manage.
Is there a way to limit the "send from any address" function to only the domain the user is part of? I tried using a wildcard like (*@test.com) but it didn't work.