Autoresponder lets you automatically reply to incoming emails with a preset message. It’s commonly used for out of office replies, vacation notices, or informing senders that you’re unavailable.
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Click on Settings on the top bar to navigate through.
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Select Autoresponder on the left hand side of the bar.

You can set two response,
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One to domain users same as the one you're using.
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The other one to any other domain other than yours.
Click on Save once you're done wit