[Exim] Virtual Domains

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Hi, I have tried to set-up virtual domains and used the router below:

  my_domains:
    driver = accept
    domains = dsearch;/etc/mail/domains
    local_parts = lsearch;/etc/mail/domains/$domain
    transport = my_mailboxes

I've built the binary with dsearch and created file virtualdomain.co.uk in /etc/mail/domains and inside that contains the local user account name

sending mail to john@??? but relay is denied,
nothing in the logs to suggest what the router may be doing
TIA
Nick.
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