Breezy borked postfix (seriously!)

[David]

First.. this has nothing to do with the flame war going on (although it 
seems that it was me who started it ;-)

Hoary/postfix worked great for local mail delivery. After upgrade to 
Breezy, postfix seems to have got reconfigured (not removed) so that it 
silently queues all email. 

/var/log/mail.err says:
Dec 22 13:41:50 localhost postfix/master[15812]: fatal: 
/etc/postfix/master.cf: line 84: bad hostname or network address: ::1:smtp

/etc/postfix/master.cf says:
127.0.0.1:smtp inet n   -       -       -       -       smtpd
::1:smtp       inet n   -       -       -       -       smtpd

/etc/postfix/main.cf says:
mynetworks = 127.0.0.0/8
myhostname = test.kenpro.com.au

david at test:~ $ cat /etc/hostname
test
david at test:~ $ cat /etc/resolv.conf
search kenpro.com.au

I have no idea where the line 
::1:smtp       inet n   -       -       -       -       smtpd
in master.cf comes from, but by commenting it out and restarting postfix, 
all my queued mail was instantly delivered, so that must be the culprit.

Can anyone suggest what I've done wrong?

Kind regards, 

David.