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If emails aren’t displayed or look strange in Mail on Mac
If you try to open an email message in the Mail app on your Mac and instead see an alert telling you to take the account online (but it’s already online), or messages appear incomplete, garbled, or incorrect, try these suggestions.
Display the message in another format. Choose View > Message > Plain Text Alternative. The alternatives available depend on the original format of the message.
See alsoMail Support website