postfix/trivial-rewrite[ ]: warning: do not list domain klunky.co.uk in BOTH mydestination and virtual_mailbox_domains

[J4K]

Hi there,

    Jan 25 18:01:46 srv postfix/trivial-rewrite[22832]: warning: do not
list domain klunky.co.uk in BOTH mydestination and virtual_mailbox_domains

I had this appear in the mail.log. 

However, the main.cf contains:
mydestination = localhost.localdomain, localhost
I am using virtual domains from mysql dB so it ought to be called from
there.

Anyone got any pointers to my mistake?

postfix version is 2.7.1-1 (from Debian Squeeze repos)

Regards, S