Hi Friends , I have Windows 2000 Advance Server + Mdaemon 6.8.4 Mail server + Mdaemon Anti Virus + ISA server 2000 Without installation ISA Server I can use of MDAEMON inside and out of my network . After ISA server installation I can’t use it in out of network and Emails can't sent by MDaemon and I receive Winsock Error (10065) on Mdaemon server. I think that is because of Firewall , No ? How can I solve it ? Regards, Farhad.