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Debian GNU/Linux Reference Guide
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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 \
                [email protected]

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.

Debian GNU/Linux Reference Guide
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