I use Thunderbird and used to have it set to prefer text-plain messages, but increasingly systems I interact with don't include a meaningful text-plain message that I've finally given up. But I generally view as "simple html" and block remote content. Here's the page about how Thunderbird interacts with Content-type: headers. http://kb.mozillazine.org/Mail_content_types I"m not sure it answers your question. To really answer your question, you might need to look at the source and read the comments. But, of course, that's totally possible with Thunderbird. Good luck! On 1/18/25 1:37 PM, Robert Heller via Hidden-discuss wrote: > Here is a totally strange question: do *any* E-Mail clients actually pay much > attention to Content-Type: headers? > > The reason I ask is because I have a home grown E-Mail client that actually > truely pays attention to the Content-Type: headers in Mime parts. But I have > encounted messages with incorrect Content-Type: headers headers. So I was > wondering, if E-Mail messages are regularly created with incorrect > Content-Type: headers headers, what happens when an E-Mail reader program > encounters a "bad" Content-Type: header? > > My E-Mail also *refers* the text/plain alternitive over the text/html > alternitive (and maillers send HTML in the text/plain alternitive!). > > I really *don't* want to use a Webmail client. I have always thought of > E-Mail as a *text* medium. > -- Steven D. BREWER <limako at bierfaristo.com> https://stevendbrewer.com/ Bedaŭro kaj ĉagreno ŝuldon ne kovras.