[account42]

Decoding   and other entities should be part of converting the HTML to text. This is absolutely basic.

> So the template has to be done once, and that's it.

Except the world is not static and then when the HTML template gets updated they'll forget the text template and now you are missing vital information. Perhaps even legally required information like unsubscribe links.

Supporting text email only makes sense if that will actually be tested. Otherwise you are better of just rendering the HTML to text locally. That's going to lose you less information than a forgotten text mail template.

[palata]

I'm not saying it's impossible. I'm just saying that they make my email experience worse by only sending HTML, and most (all?) of the time, it's absolutely unnecessary.

And again, HTML brings security concerns.