localpartlist dom_locals = ${expand:KV(locals, {$value}{+user_extaddr})}
localpartlist user_extaddr = ^CONF_user_extaddr_regexp
addresslist user_extaddr = ^CONF_user_extaddr_regexp
+addresslist value = $value
## All of the `standard' local parts which ought to be provided by a domain.
localpartlist required = postmaster : abuse