Hi, I have problems to send email to others domains, (yahoo; hotmail; etc..). I only can send email to my domain of my company and of my ISP... I receive the next error:Message delivery to the remote domain 'yahoo.com' failed for the following reason: The connection was dropped by the remote host. I have one server with ISA Server and SMTP Service runs and other server with only exchange that connect to the SMTP Server. But this server don't forward to the correct domain (yahoo, hotmail, etc..) Thank's a lot