[Exim] probleme with shown reception

helo i'am using exim 4.22 and i have to domains
one is my intranet "xxxxxxx@??? "
and second is "xxxxxxxx@???"
i have configure my mail client with the first adresse and i want to rewrite the domaine name if a user send a email on internet
my configuration is good
during the smtp transport on internet irewrite the header reply to but i can'thave a shown reception if i want one.
i don't know why????
please give me your help.