Enable interpolation of alias destinations This patch modifies the virtual_alias_maps function so that the destination address is parsed for the place holders %n, %d and %=, which are replaced with the localpart, the domain or the full address with '@' replaced by '=' of the queried key. In combination with alias domains, this allows for domain-specific recipients. E.g. given example.org and its alias domain example.com, defining an alias postmaster@example.org → postmaster+%d@example.org will cause mail to postmaster@example.*com* to go to postmaster+example.*com*@example.org.

# All parameters are described in pgsql_table(5) / PGSQL PARAMETERS
#
# The hosts that Postfix will try to connect to and query from.
hosts = localhost

# The user name and password to log into the pgsql server.
user = postfix
password = some_password

# The database name on the servers.
dbname = mailsys

# The SQL query template used to search the database
query = SELECT destination FROM postfix_virtual_alias_map('%u', '%d')