Hi, All I tried to unlimit the sizeof message, but it doesn't seem to work. I unmarked the checkbox at the Message Tab of SMTP Virtual server properites. But the client still got errors of '552 4.3.1 Message size exceeds fixed maximum message size' I stopped and started the virtual server, but it doesn't change anything. Does anyone has idea? Thanks

Thanks for the answer and link. Since I already unmark the limit session size checkbox, and still bigger size messagen didn't go through. I will ask this question again at the forum you mentioned. Regards