Hello all, I need some help seting up a Excahnge 2003 to relay email trougth a Excahnge 5.5 Server , let me try to explain , I have 5 separated domains , all NT4 based domains , I just promote one of this domain to a 2003 domain in mixed mode , i have instaled a Exchange 2003 In the DC and I need that this server sends and receives e-mail trougth a Excahnge 5.5 in other domain. now , the mixed domain that I have created is named INTERNAL.DOMAIN.COM , and my NT domain is just DOMAIN.COM. Now I think that i have to setup the main DNS server to point all mail that is @INTERNAL.DOMAIN.COM to the Exchange 5.5 and setup the Excahnge 5.5 to accept and foward all that mail to the Excahnge 2003 ? Is this right ? Continuing , I need to setup the Exchange 2003 to send all outgoing e-mail to the exchange 5.5 server and setup the 5.5 to relay those messages right ? also , I need to setup ADC to keep my global adress list updated with the other domains , if there is another way i will apreciated... Anyway folks , I hear that you all the Best in Excahnge and I will be very thankfull for any help... ( Sorry abouth the english , not a very good writer...) Thanks...