a message like this:

From: bob@example.com
To: alice@example.org
Subject: multipart mixed test
Date: Tue, 2 Apr 2024 11:55:29 -0400
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: multipart/mixed; boundary=17120733290.674Ca4D.3197283

--17120733290.674Ca4D.3197283
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is part one
--17120733290.674Ca4D.3197283
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is part two
--17120733290.674Ca4D.3197283
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is part three
--17120733290.674Ca4D.3197283--

These parts are body parts, not strictly speaking file attachments. eM displays "This is part one" and shows the other 2 parts as file attachments. While this is minimally acceptable, some mail clients display the parts inline. For example:

This is part one

This is part two

This is part three

I would like to see eM display (or have an option to display) unnamed multipart/mixed body parts inline similar to the above. K9 on Android does this.

I have seen some mailing lists attach a body part to messages, for example, with list info. I have also seen some email security systems add a security banner in an additional attahment. It is useful and more natural to see them inline rather than click on and open these as a separate attachment.