Quote:
Originally Posted by
x_terminat_or_3
vsaini44, when a firewall denies access, it *can* send back a packet saying access forbidden, but this is done on the ICMP level, which runs on a much lower level than the mail application. It is basically up to the mail application to detect that a connection not works and display the appropriate message to the user.
can u tell me how to implement the same with ICMP level option, plz
