Finally, a check for a catchall address of the form @host needs to be made in the mailAlternateAddress attribute. This form of wildcarding is allowed in both hosted and vanity domains, so the proper alias URL for it is:
The +* subaddress substitution mechanism has always worked with catch-all addresses in direct LDAP mode, but the string that was substituted was the subaddress only, not the entire local part. This has been changed so that the entire local part of the original address will be plugged into the catch-all address as a subaddress when this construct is used.
For example, given an address of the form email@example.com, no local user foo in the domain.com domain, and a catch-all address for domain.com of firstname.lastname@example.org, the resulting address will now be email@example.com. It used to be firstname.lastname@example.org.