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By default, the server sends back an acknowledgment message replying to every incoming messages.
It says the moves have been successfully taken, or if an error occurred with them.
When we take many moves a day the many answer messages can be annoying. There is a setting, if set, the server sends back replies only if something wrong happened with the move. If it could be taken in order, no reply will be sent back, only in case of error.
This is the Reduced Email Traffic setting, which prevents us from getting many annoying acknowledgment messages.
Available from Jan 01, 2002.