[Exim] domain list question

hello,

i need to deliver all message send to my.domain to mail1.my.domain and
mail2.my.domain,
i've add in routers section:

local:
    driver = domainlist
     transport = remote_smtp
     route_list = my.domain mail1.my.domain:mail2.my.domain byname

he don't work exactly for my need , please can you help me ?