cant receive from a specific email

cant receive from a specific email

hello ,
i have a serious issue 
this email  g.m@nettlogistics-eg.com is belong to our domain www. nettlogistics-eg.com &  cant receive any emails from  bdd5@multiwell.net   

however all xyz@nettlogistics-eg.com  domain emails can receive normally  from  bdd5@multiwell.net   
would you please assist 

Best Regards 
Mohamed Azhary