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Hi! The current version of sshd allows to restrict keys to issue only specific commands. However, port forwarding can only be forbidden entirely. Given the following situation: A client C uses S as a POP3 server. We want to poll E-Mail via POP3 from S to A via an ssh tunnel without being asked for a password. Thus, we create a passphrase-less key pair on A, transmit the public key to S and