$v->address( -address => 'blort@notarealdomainfoo.com',
             -mxcheck => 1) ? not_ok : ok;   

##</code><code>##

[root@devel3 root]# dig -tA notarealdomainfoo.com

; <<>> DiG 9.2.2 <<>> -tA notarealdomainfoo.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21892
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 13

;; QUESTION SECTION:
;notarealdomainfoo.com.         IN      A

;; ANSWER SECTION:
notarealdomainfoo.com.  900     IN      A       64.94.110.11

;; AUTHORITY SECTION:
com.                    68041   IN      NS      e.gtld-servers.net.
com.                    68041   IN      NS      i.gtld-servers.net.
com.                    68041   IN      NS      k.gtld-servers.net.
com.                    68041   IN      NS      b.gtld-servers.net.
com.                    68041   IN      NS      l.gtld-servers.net.
com.                    68041   IN      NS      c.gtld-servers.net.
com.                    68041   IN      NS      d.gtld-servers.net.
com.                    68041   IN      NS      g.gtld-servers.net.
com.                    68041   IN      NS      m.gtld-servers.net.
com.                    68041   IN      NS      j.gtld-servers.net.
com.                    68041   IN      NS      a.gtld-servers.net.
com.                    68041   IN      NS      f.gtld-servers.net.
com.                    68041   IN      NS      h.gtld-servers.net.

;; ADDITIONAL SECTION:
e.gtld-servers.net.     134007  IN      A       192.12.94.30
i.gtld-servers.net.     150216  IN      A       192.43.172.30
k.gtld-servers.net.     150216  IN      A       192.52.178.30
b.gtld-servers.net.     150216  IN      A       192.33.14.30
l.gtld-servers.net.     78864   IN      A       192.41.162.30
c.gtld-servers.net.     150216  IN      A       192.26.92.30
d.gtld-servers.net.     150216  IN      A       192.31.80.30
g.gtld-servers.net.     147680  IN      A       192.42.93.30
m.gtld-servers.net.     150216  IN      A       192.55.83.30
j.gtld-servers.net.     150216  IN      A       192.48.79.30
a.gtld-servers.net.     72621   IN      A       192.5.6.30
f.gtld-servers.net.     86057   IN      A       192.35.51.30
h.gtld-servers.net.     126375  IN      A       192.54.112.30

;; Query time: 23 msec
;; SERVER: 207.218.192.38#53(207.218.192.38)
;; WHEN: Tue Sep 30 01:37:27 2003
;; MSG SIZE  rcvd: 508

[root@devel3 root]# dig -tMX notarealdomainfoo.com

; <<>> DiG 9.2.2 <<>> -tMX notarealdomainfoo.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15188
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;notarealdomainfoo.com.         IN      MX

;; AUTHORITY SECTION:
com.                    172800  IN      SOA     a.gtld-servers.net. nstld.verisign-grs.com. 2003092901 1800 900 604800 86400

;; Query time: 43 msec
;; SERVER: 207.218.192.38#53(207.218.192.38)
;; WHEN: Tue Sep 30 01:37:32 2003
;; MSG SIZE  rcvd: 112

[root@devel3 root]#