Choose the radio buttons for the settings you want to activate. You can customize the following settings: 
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Accept Messages From: allow anyone to send messages to the site email address, or allow only site participants to do so.
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Set the reply-to address: when receiving an message from Email Archive, allow recipients to see and respond only to the site email address, or allow recipients to respond to the original sender's email address.
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Send messages to: send email to site participants as well as archiving the messages, or archive messages without emailing the site participants.