Settings | Usage | Troubleshooting
Chatty implements the /w command that Twitch Chat
        provides, allowing you to send private messages in chat to other users.
        Chatty does not provide the Whisper History as on the website and is
        only a very basic implementation in general.
The Whisper Feature is disabled by default.
In April 2016 Twitch moved Whispers from the Group Chat servers to the new AWS Twitch Chat servers. There is no additional server configuration required anymore.
whisper will be able to send whispers to you.
                Messages from other users are discarded. Alternatively you can
                also blacklist users by adding them to the
                blockwhisper category (which makes most sense with
                the Whitelist setting disabled).Miscellaneous - Ignore (whisper). Unlike
                the Blacklist or Whitelist using the Addressbook, this will not
                completely discard the messages, but instead add them to the
                Ignored Messages dialog and possibly output some other messages
                about it, depending on the Ignore settings.<name>
                        <message> instead of having to use the
                        /w command. To be sure you actually provide
                        the user to send it to you can only whisper to users
                        that have already whispered to you (so e.g.
                        Hey how are you? :) wont't be send to the
                        user named Hey). The tab for collecting all
                        whispers is named $[whisper].$<username>.[Auto-Message] This user has not
                allowed to receive whispers from you.. The message is
                only sent once per session to each different user that whispers
                to you and is also spam protected.When the Whisper Feature is connected ([W] appears in the
        titlebar) you can receive and send whispers:
-[name]-/w <name> <message>, then this will be
            indicated in chat by the nickname being marked like this:
            >>[name]/me).