Unfortunately that add-on is not available for Cloud, and I don't believe there's anything similar available.
My suggestion is to get in touch with the Send email to Page developers, so they can work with Atlassian Connect team, and develop this add-on using Atlassian framework, and this way it will be available for Confluence Cloud.
It started as any story starts, on a normal, rainy day. Admin meets App, and her name was Klok2, and like any first relationship we were both trying to make it work but neither one knew what...
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