Created attachment 860384 [details] screenshot Description of problem: not seen text in message
Created attachment 860385 [details] example message
Thanks for a bug report and a test message. I can reproduce it too with it, and it seems to me that the issue is the image, which covers whole message body. Even it is added to the HTML before actual text, WebKit renders it above the text, which effectively hides what is written inside. You can right-click on the image and choose "Display plain text version" (first left-click on the message, then right-click), which will show the text without the image and any special formatting. An alternative is to go to Edit->Preferences->Mail Preferences->HTML Messages->Plain Text mode sections, select any other option than "Show HTML if present", which will show the plain text part rather than the HTML (but it applies to all messages). With checked "Show suppressed HTML parts as attachments" you'll still be able to see the formatted part. Anyway, this seems to me as a bug in webkitgtk3, thus I move this there.
Created attachment 860434 [details] HTML version of message
So I made a HTML version on that message and neither Firefox or Chrome can render it properly. So it looks like Microsoft's fault (they should probably use CSS z-indexes).
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