Bug: Garbled and truncated messages with pasted image

Per internal ticket #708898, can't believe I have to submit a feature request for this obvious bug.

Problem: Pasting an image into an (Simple Mail*) email garbles the MIME encoding then either encodes or deletes the remaining text.

Solution(s):

1. Either fix the embed (which appears to work fine in your editor window) or don't allow paste of content types that allow silent failure e.g. strip tags & only allow b, i, href, p or whatever.

2. Don't blame your users for your software breaking things, not warning about it, and not preventing it either.

Example Images:
As shown in the Editor: https://recording.offermagic.online/MCtKBRgvsvxnS6620blS

As received: https://recording.offermagic.online/FXK65TzjK423VQYzNY6w

* There's a reason I used Simple Mail and not OntraMail or Raw HTML. I thought it would get over all the obvious issues in your older mail editors. Clearly not, as you also still get all the strange font-resizing issues too.