Yes, it's all about diferent Content-Type I tried to send it by Outlock express and it works! Outlock: Content-Type: application/octet-stream; name="eicar.com" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="eicar.com" Mozilla: Content-Type: text/plain; name="eicar.com" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="eicar.com" Thanx for help. RaBL