Default setting on Call for Abstract book

The Call of Abstract book setting for email is set to “Submitter” by default
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The published Call for Abstract book has attracted spammers who have been scrapping the emails off the Call of Abstracts book and sending publishing request to all our users.

Would it be advisable to set the setting to “None” as a default to avoid this situation and making it an option for the admin to opt-in.
Our sys admin has added some CSS to remind the team to switch to none.

Would there be a way to make these emails available to only people who signed in. For now, we opted just to remove the emails all together to stop the spamming.

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