Wildcard MX not working correctly

[Alan Williamson]

> > What am i missing?  Many thanks.
>
> Posting the full zone file and the real query that is failing.

[ip addresses replaced to protect the innocent]
___________________________________

x.com.  IN      SOA     ns1.w.y. info.x.y. (
                        2006050529
                        7200
                        7200
                        604800
                        86400 )
;
                NS      ns1.w.y.
                NS      ns2.w.y.
                NS      ns3.w.y.

                IN      A       1.2.3.4

www1            IN      A       1.2.3.4

list            IN      A       5.6.7.8

time            IN      A       5.6.7.8

email           IN      A       3.4.5.6

x.com.          IN      MX 10 a.b.c.d.
list.x.com.     IN      MX 10 a.b.c.d.
*.x.com.        IN      MX 10 email
___________________________________

$ dig test.x.com MX

; <<>> DiG 9.2.5 <<>> test.x.com MX
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21778
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;test.x.com.           IN      MX

;; Query time: 49 msec
;; SERVER: 62.6.253.69#53(62.6.253.69)
;; WHEN: Wed May 31 10:15:16 2006
;; MSG SIZE  rcvd: 37