SMTP routing all messages to Postmaster to Root and then null...

Anyone got any idea what might be causing this...?
Have a very simple OS X Server.  Until upgrading to Server 3 / 10.9 it all worked fine.  Then, after upgrade, I stopped getting mail on the Postmaster account.
Digging into SMTP log shows that server is simply forwarding all mail to postmaster to the root account, and then forwarding those messages to the null device.
Here is a lightly obscured entry from the log illustrating:
Oct 29 22:00:52 www.abc.xyz postfix/local[46314]: 4D5091253EA8: to=<[email protected]>, orig_to=<[email protected]>, relay=local, delay=0.01, delays=0.01/0/0/0, dsn=2.0.0, status=sent (delivered to file: /dev/null)
I have no idea why it is doing this, but would very much like it to stop!  Called Applecare and they didn't know anything - suggested I read the 'advanced administration manual for Server 3' - which I did.  But doesn't contain anything meaningful on this topic.
Any help anyone can offer would be most appreciated!

Thanks for the info. That's stopped the messages being forwarded from root to the null device, but they are still being sent to the root account - not sure how to access these messages (as there is no obvious way to access the mail forwarded to root account: there is no 'root' account defined for the mail server).
Here is an example of the messages concerning this in the log...
Oct 30 11:33:18 www.abc.xyz postfix/pipe[36354]: 761F612672E3: to=<[email protected]>, orig_to=<[email protected]>, relay=dovecot, delay=0.04, delays=0.01/0/0/0.03, dsn=2.0.0, status=sent (delivered via dovecot service)
Thanks in advance for whatever help you can provide.

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