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Top Forums Shell Programming and Scripting Sendmail Fails to send emails from Linux server. Post 303003024 by Corona688 on Wednesday 6th of September 2017 04:48:55 PM
Old 09-06-2017
You could try to connect to port 25 in telnet. If you can connect from a different machine, it's obviously not firewalled. If you can't connect even from the same machine, port 25 isn't being listened for.
 

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KF(1)							    BSD General Commands Manual 						     KF(1)

NAME
kf -- securely forward tickets SYNOPSIS
kf [-p port | --port=port] [-l login | --login=login] [-c ccache | --ccache=ccache] [-F | --forwardable] [-G | --no-forwardable] [-h | --help] [--version] host ... DESCRIPTION
The kf program forwards tickets to a remote host through an authenticated and encrypted stream. Options supported are: -p port, --port=port port to connect to -l login, --login=login remote login name -c ccache, --ccache=ccache remote cred cache -F, --forwardable forward forwardable credentials -G, --no-forwardable do not forward forwardable credentials -h, --help --version kf is useful when you do not want to enter your password on a remote host but want to have your tickets one for example AFS. In order for kf to work you will need to acquire your initial ticket with forwardable flag, i.e. kinit --forwardable. telnet is able to forward tickets by itself. SEE ALSO
kinit(1), telnet(1), kfd(8) Heimdal July 2, 2000 Heimdal
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