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The way you asked your question, I am unclear whether
you are unsubscribing yourself or unsubscribing the
authors of the messages.
You should be able to unsubscribe yourself
for the whole forum, even though you
are the owner. If you write a message, you might
be subscribed just for that message,
unless you unsubscribe for that too.
You can configure the whole installation to automatically
unsubscribe authors of responses. See $defaultNotification
in your hnrc file.
Authors of messages can explicitly unsubscribe when they
write their message, by unchecking the Notify Me checkbox.
The default setting of this checkbox comes from $defaultNotification.
More options are possible, but they haven't been a priority.
For example, a default subscription setting for each person
might be useful and do what you want.
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Other ways to unsubscribe 
Automatically have Unsubscribe as default
