> <a...@xxxx.org>: host mailhost.zen.co.uk[212.23.3.98] said: 550-Verification
>    failed for <a...@xxx.lan> 550-Unrouteable address 550 Envelope Sender:
>    Domain must resolve in DNS! (in reply to RCPT TO command)

It looks like your outgoing mail from your local user(s) needs to be 
masqueraded or the whole server does.
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