Summary
To fix the issue of email content not loading on Mac, users can disable the Mail Privacy Protection feature in the Mail app by selecting Mail>Preferences>Privacy and disabling “Protect Mail Activity” / “Hide IP address” / “Block all remote content”.
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Additionally, users can turn off the message "Unable to load remote content privately" in the Mail app on Mac
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, turn off iCloud Private Relay on Mac
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, and turn off Mail Privacy Protection for the Mail app on iPhone.
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If the issue is caused by a Virtual Private Network, users can bypass it by tapping the "Load Content" option on the warning.
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According to