On 11/19/2011 10:03 AM, Anne Wilson wrote:

> What I want to achieve - any mail addressed to x...@lydgate.lan is put onto 
> my 
> IMAP server's mail spool for the person concerned.  

All domains listed in mydestination are delivered on the local machine.
http://www.postfix.org/BASIC_CONFIGURATION_README.html#mydestination

So according to your stated goals, use:
mydestination = lydgate.lan


> Any mail other than 
> addressed to x...@lydgate.lan should go to mailhost.zen.co.uk.

To deliver everything else to your ISPs mail relay, put that in the
relayhost parameter
relayhost = [mailhost.zen.co.uk]
http://www.postfix.org/BASIC_CONFIGURATION_README.html#relayhost

You likely don't need transport_maps because it's for exceptions to
the above delivery rules.

> In view of this, what should $myorigin and $mydestination be?

http://www.postfix.org/BASIC_CONFIGURATION_README.html#myorigin
myorigin = lydgate.lan



All your questions are answered here:
http://www.postfix.org/documentation.html

If you're not familiar with general email principals you may need to
review the various README files several times before they start to
make sense.  But they will.




  -- Noel Jones

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