I'm afraid that Confluence doesn't have this feature, although there's a request for this: https://jira.atlassian.com/browse/CONF-1726
For Confluence server there's a plugin that I'm aware of to achieve it: https://marketplace.atlassian.com/plugins/biz.artemissoftware.plugins.confluence.send-email-to-page
However, this plugin does not exist for Confluence Cloud.
I hope it helps.
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