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Some But Not All Emails Show as Plain Text Instead of HTML

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Some of my incoming emails have become displaying at plain text instead of HTML in Thunderbird.

I have tried toggling View>Display Attachments Inline, View>Headers>All vs. Normal, and View>Message Body As>Original HTML vs. Simple HTML vs. Plain Text. Nothing seems to correct this handful of emails.

When I browse the same emails via a browser at mail.yahoo.com, the appear as normal HTML.

Until this occurred, I had not made any configuration changes to Thunderbird or my Windows laptop.

Thanks in advance for any suggestions.

Some of my incoming emails have become displaying at plain text instead of HTML in Thunderbird. I have tried toggling View>Display Attachments Inline, View>Headers>All vs. Normal, and View>Message Body As>Original HTML vs. Simple HTML vs. Plain Text. Nothing seems to correct this handful of emails. When I browse the same emails via a browser at mail.yahoo.com, the appear as normal HTML. Until this occurred, I had not made any configuration changes to Thunderbird or my Windows laptop. Thanks in advance for any suggestions.

All Replies (4)

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Can you post a screenshot of one of these message's source code?

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Hello Moz help, I have multiple accounts in TB. Everything is OK, HTML messages are OK. Except for one contact. When I receive/send a message from/to this contact, message is always plain text. With this contact, if I write a new message and insert an image in the message body, everything seems OK at first, but TB silently drops the image and turns the message into plain text after it was sent. Classic attachments are OK. I tried to find a setting about it somewhere, but no luck... Thank you. Olivier

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Just a suggestion: check the addressbook entry for this person to see if it is set for plain text. That is a feature of Thunderbird that is often forgotten.

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I thought about that, but I did no go as far as Contact > Lists. Should be OK now. Thanks!