[Exim] help with mailing lists

goog morning.

Just a quick question.

How do you set up , for example, a mailing list
for dns-admin@???. this has to be forwarded to 6 users?

Secondly. sendmail uses virtualusertables, how do you set it up in exim?
My exim server will reflect in the mx's for 8 domains as the primary but
it needs to forward all the mail to the exchange server.

Thanks for all the previous help.

Regards,

Tom Kinghorn