Dear exchangelist; i use site connector to replicate all exchange site in our organization. let's say that in headquarter i use site connector (to replicate with all branches site and imc to isp dns), so i've been registered my domain 123.com in that isp. and my question, is it possible to use one dns over imc in headquarter if all branches domain will publish too (a.123.com ; b.123.com ; etc -> smtp addresses) without configure imc in that own site? i meant just route over headquarter, and if possible, what should i do? Thank's in advanced..... Best Regards; Amos