DNS Problems: Beyond Life with qmail

[GD695372]

I'm having a lookup problem with qmail. qmail will not resolve any mx records at all. The only way I can get it to work is by putting another mail server's ip address in the /var/qmail/control/smtproutes file. DNS is working just fine on the machine. Both nslookup and dig yield valid results, and other processes don't seem to be having any time resolving addresses. I did check that it can resolve mx records with DNS. I've never used qmail before, so this is kind of a new experience, although I have installed and configured djbdns before. I'm starting to dislike Bernstein...

Following are the contents of some of the config files:

cat /etc/tcp.smtp
127.:allow,RELAYCLIENT=""
192.168.11.:allow,RELAYCLIENT=""
192.168.12.:allow,RELAYCLIENT=""
192.168.15.:allow,RELAYCLIENT=""
192.168.16.:allow,RELAYCLIENT=""

ls /var/qmail/control/
concurrencyincoming locals rcpthosts virtualdomains.old
defaultdelivery me smtproutes.old
defaultdomain plusdomain virtualdomains

cat /var/qmail/control/concurrencyincoming
20

cat /var/qmail/control/locals
nothing in this file...

cat /var/qmail/control/rcpthosts
<external domain>.com
<internal domain>.com

cat /var/qmail/control/defaultdelivery
./Mailbox

cat /var/qmail/control/me
reverseproxytest.<internal domain>.com

cat /var/qmail/control/defaultdomain
<internal domain>.com

cat /var/qmail/control/plusdomain
nothing in this file...

cat /var/qmail/control/virtualdomains
nothing in this file...

Any suggestions would be greatly appreciated. I've pretty much run out of ideas.