Hi, Using a typical modern email client such as Gmail, the messages are usually html formatted.
Then, Hyperkitty displays attachment.html on every message. Can that be removed? I was searching for the topic "attachment.html" in the archives and there wasn't much information. What finally cracked the code was Mark's comment:
If in Postorius on the list's Settings -> Alter Messages page, Filter Content and Convert html to plaintext are both Yes, the HTML should be converted to plain text and that should appear in HyperKitty.
It turns out "Filter content" affects many settings. It's easy to skip over that. I wonder if the UI might call attention somehow, with a graphic element, or with text: "Settings on this page will not take effect. Because 'Filter content' has not been enabled". It is right that "Filter content" must be set in order to remove attachment.html ?
And now, a search will have more results. :-)