This feature is disabled, because Discord has refused to give us message content intents.
Use /responder list to view your current auto-responders.

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Adding Auto-Responders

To add an auto-responder, you can use the following command: 
/responder add <trigger> <response>
If your trigger is more than 1 word, and you are not using slash commands, you need to put it inside of quotation marks.

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Removing Auto-Responders

To remove an auto-responders, you can use the following command: 
/responder remove <trigger>
Here you don’t have to use quotation marks at all, even if your trigger is more than 1 word.

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Example