It looks like user based restriction on ISA. If you use it check that possibility. Zoran > i'm sending from my email a.abuzaid@xxxxxxxxxxxxxx to hotmail sending > without any problem . > when i send from another user j.abuasab@xxxxxxxxxxxxxx > to hotmail he send the mail but i don't recieve it at hotmail . > > this problem temproly appear some users can send and some user can't . > > the user who can't send to hotmail can send every where just hotmail he > can't . > > so i have a larg problem > > please help me