Every good email comes with two parts. The HTML version with formatting, and a plain text version with just text. That second part is often forgotten in practice. Understandably, since hardly anyone ever sees it. But spam filters do pay attention to it, and some email clients prefer text over HTML.
We now take care of that for you. With the plain text fallback on your route, we automatically generate a text version for every email that only contains HTML.

How it works
The HTML version is what most people see, with formatting, colors and buttons. The plain text version is the same email as plain text. Spam filters look at both. An email with both versions comes across as more complete and trustworthy, and stands a better chance of landing in the inbox. Screen readers and some email clients also fall back on the text version.
That is why we developed the plain text fallback. Send an email without a text version and we generate one automatically based on your HTML.
The fallback is off by default and you enable it per route. You can do this in the dashboard under your route settings. You can also enable it through the Team API.
Including your own plain text version remains the best choice, since it gives you full control over the content. If you include one, that version stays untouched. As the name suggests, this feature is meant as a fallback.
The plain text fallback is available on all accounts. Enable it under your route settings on app.lettermint.co. The documentation explains exactly how it works.