[exim] mysql expansion

My redirect router looks like


data = ${lookup mysql{select mailbox,host from routing where alias =
'${quote_mysql:$local_part}'}}

according to the spec this will return

mailbox=testuser host=testhost.qub.ac.uk

how do i change this to be mailbox@host ?

thanks
--
Regards

Ronan McGlue

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Analyst / Programmer
Queens University Belfast