Will try that and see what I get though what I do not understand is why it 
works fine for a remote client but not if the client is localhost.  What would 
cause the difference?

Thanks for your help so far.
Steve

On 30 Sep 2014, at 15:20, Wietse Venema <wie...@porcupine.org> wrote:

> There is no "undefined" in Postfix so you have a bug in your
> database lookups.
> 
> Test the queries (as seen in logfile) by hand.
> 
> When a result does not exist, the database MUST return NOTFOUND
> 
> The database MUST NOT return an empty result.
> 
> The database MUST NOT return "undefined" or other crap.
> 
>       Wietse
> Steve Hawes:
>> That was really logged by postfix. This is the bit that is driving me mad as 
>> the To address is there at the start of the trivial-rewrite process but by 
>> the time it finishes all that is left is <undefined>
>> 
>> Steve
>> 
>> On 30 Sep 2014, at 14:29, Wietse Venema <wie...@porcupine.org> wrote:
>> 
>>> What does <undefined> mean? Is that something that you changed, or is that
>>> really logged by Postfix?
>>> 
>>>     Wietse
>> 
>> 

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