9.5.2 Port forwarding for SMTP/POP3 tunneling
To establish a pipe to connect to port 25 of remote-server from port
4025 of localhost, and to port 110 of remote-server from port 4110
of localhost through ssh, execute on the local machine:
# ssh -q -L 4025:remote-server:25 4110:remote-server:110 \
username@remote-server
This is a secure way to make connections to SMTP/POP3 servers over the
Internet. Set the AllowTcpForwarding entry to yes in
/etc/ssh/sshd_config of the remote host.
