Email Preview shows “{DOMAIN}.vf.force.com refused to connect” error
To resolve this issue, navigate to Setup ->Session Settings
Under Trusted Domains for Inline Frames, click Add Domain
Copy the current url from your browser address bar
Keep only the domain part which ends with force.com
Ensure to remove the https://
Paste this domain in the Domain field and the iFrame Type should be visualforce
Save
The Email Preview page should now load correctly.
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