Created attachment 8865884 [details] The mail opened in message preview, the text is centered although it is plain-text User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36 Steps to reproduce: Compose a new plain-text email and attach a HTML file that uses styling similar to the following: <html> <body style="text-align: center;"> </body> </html> Then view the email in the message preview or message window. Actual results: In both the message preview and message view the content of the email is centered. (see screenshot attached) I suppose this is related to the inline-display of the HTML content. Expected results: The styling of the email is not changed by an attached HTML document.
Yep, that's a known limitation ... and a very old bug from 2000. Last time someone attempted a fix was in bug 1297653.