frikandel/email: make sure emails reach the right catch-all

hosts/frikandel/email.nix

@@ -207,7 +207,7 @@ in {
         # replace rcpt to catchall and deliver it there
         destination $(local_domains) {
           modify {
-            replace_rcpt regexp ".*" "mail@$(primary_domain)"
+            replace_rcpt regexp "(.+)@(.+)" "mail@$2"
           }
           deliver_to &local_mailboxes
         }