Symantec Messaging Gateway 10.0.1 receiving email problem

Hi guys,i'm new here.kinda need help on our messaging gateway.

Situation :(SENDER LOCAL USER+EXCHANGE+SMG 10.0.1)  >>   (MAIL+RECEIVER)
                got no problem to send out and being log by the SMG 10.0.1

                (SENDER LOCAL USER+EXCHANGE+SMG 10.0.1)  <<   (MAIL+RECEIVER) 

                 receiver email cannot come in and there's no error capture by log or anything.But it only happen on one specific domain sender only.We're not  

                suspecting the problem cause by them because before this we have use fortimail and barracuda and got no problem at all with that domain.

So if you guys got any clues for my problem it will very much helpful.