Rated 5 out of 5 stars

le Geremia10 ar Márta 19, 2018 · buan-nasc

Even in TB 52.x, this extension is needed to enable default plaintext delivery formatting (so you can compose as HTML and convert to plaintext for delivery).

"prefer sending plain-text e-mails" will only deliver as plaintext if no HTML is detected during the email's composition.