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EugenD-7106 asked KaelYao-MSFT commented

Outlook & OWA displays plain text, instead of formatted HTML display

Hi All,

Seems like the HTML formatting is not working in Outlook 2016 & OWA . This is not happening from all senders and not affect all users.
We got a Exchange 2013 & O365 Hybrid Environment.
One HTML formatting Email from one sender shown as plain-txt.

  • Users onprem & o365 are affected

  • OS Win10

  • All use the same Outlook 2016 Version

  • Outlook Trust Center Settings are the same

  • HTML” option is selected against “Compose messages in this format


BR Eugen



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Hi Eugen.

According to the information provided, this issue seems to only occur on emails from a specific sender.

I would like to confirm with you:
1) Does this issue occur on all emails from the sender or just on some of them?
2) Do you have a mail flow rule setup for this sender?

Thanks in advance for your update.

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Dear KaelYao-MSFT,
1) it occur not on all emails just on some
2) no mail flow rule setup

BR Eugen

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Hi,
Since OWA is having the same problem, I suppose this issue may be on the sender's side.
Would it be possible that the emails were actually sent in plain text?

Please have a check of the message header and check the Content-Type part.
How to check message headers in Outlook: View internet message headers in Outlook


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