Is it possible to use a wildcard like this in an action rule ?
No.
man 5 table
...
In a virtual domain context, the key is either a user part, a full email
address or a catch-all, following selection rules described in
smtpd.conf(5), and the value is one or many recipients as described in
aliases(5):
user1 otheruser
[email protected] otheruser1,otheruser2
@example.org [email protected]
@ [email protected]
...
But maybe it's doable with a SQL extra and a fancy query, though.
