[exim] mysql relay_from_hosts?

Hi,



I'm trying to look up my relay_from_hosts from a MySQL database. I see
that the hostlist format requires a colon inbetween each entry, any idea
how I can do that while still looking up each value from a database?



The closest I have got so far is this but it's not quite working due to
the colon issue.



hostlist relay_from_hosts = ${lookup mysql{select ipaddress from
relay_hosts;}}



Many thanks!

Jeremy