lookups in router not wanted

["Michael R. Gettes" <gettes@Princeton.EDU>]

I have a configuration problem.

I have set toplevels= all toplevel domains. From my testing, if I give
an address that cannot be located via DNS (like yzhou@MECAD.HUST.EDU.CN)
the router does not get hung in looking it up DNS. However, when
in production, I am getting

search_res: deferred: mecad.hust.edu.cn: any (host name lookup/try again) error

How I tested is shown below... if my test is invalid, let me know my error.

I have hundreds of messages going to this address so the router is
getting blocked and now I have a MAJOR backlog of mail. I am not sure
how to get out of this. Any help or pointers is appreciated.

I am using 2.99.45 without modifications to the .cf files except as noted
above.

/mrg

P.S. I tested with the following:

[2198]su.outbound.Princeton.EDU--> router -i
ZMailer router (2.99.45 #1: Tue Mar 11 21:10:19 EST 1997)
  gettes@outbound.Princeton.EDU:/var/local/c/zmailer-2.99.45/router
Copyright 1992 Rayan S. Zachariassen
Copyright 1992-1996 Matti Aarnio

z# . router.cf
relation: expansions is already a defined database!
relation: hostexpansions is already a defined database!
relation: recipients is already a defined database!
relation: istoplevel is already a defined database!
relation: thishost is already a defined database!
relation: routesdb is already a defined database!
relation: canon is already a defined database!
relation: mxhosts is already a defined database!
relation: ipaddress is already a defined database!
relation: revaddress is already a defined database!
relation: aliases is already a defined database!
zz# router yzhou@MECAD.HUST.EDU.CN
(((smtp MECAD.HUST.EDU.CN yzhou@MECAD.HUST.EDU.CN default_attributes)))
zz#