I just install a qmail server under a linux box, everything works fine until today i got a call from a remote subnet user, he cannot get to the server.
i investigated the problem, i can ping to any other windows server but i can not ping to linux server from this remote subnet.
i think this is not the routing issue, if it is, i should not able to ping windows server either.
there is not iptables/ipchains configued on linux, no firewall at all.
the routing device between two subnet is dec brouter 90, working fine until i got this problem.
any idea...