I've got a sendmail server that I've given heavy firewalling through IPchains. Apparently it was too heavy, because now sendmail won't work at all. I've got: ipchains -A input -i eth0 -p tcp -s any/0 80 -j ACCEPT ipchains -A input -i eth0 -p tcp -s any/0 25 -j ACCEPT ipchains -A input -i eth0 -p tcp -s any/0 110 -j ACCEPT ipchains -A input -i eth0 -p tcp -s any/0 6667 -j ACCEPT and sendmail was firewalled out. After consulting the book "linux firewalls", I was reminded that e-mail uses some ports > 1023 (at least Groupwise does, so it made sense) so now I've got: ipchains -A output -i eth0 -p tcp -s 12.27.41.52 1024:65535 -d any/0 25 -j ACCEPT ipchains -A output -i eth0 -p tcp ! -y -s 12.27.41.52 25 -d any/0 1024:65535 -j ACCEPT ipchains -A input -i eth0 -p tcp -s any/0 1024:65535 -d 12.27.41.52 25 -j ACCEPT ipchains -A input -i eth0 -p tcp ! -y -s any/0 25 -d 12.27.41.52 1024:65535 -j ACCEPT and it's still firewalled out. Any ideas? Sendmail works 100% when I ipchains -F. -Brian