Hi @phonyroyal, thanks for your message.
I can’t tell too much without seeing it, but there is a chance that your email software (or plugin if you use one for SMTP) is sending HTML emails as a Plain Text content-type
if you’re just seeing code like that so that could be worth checking at your host or on your site.
If HTML email source is just being displayed instead of rendered as it should, the receiving mail client can be an issue too. It could be worth double-checking that wordpress@yoursite[dot]com is considered a safe source in case the HTML isn’t being rendered by the email client for that reason. Checking the headers of the received email for the content-type
mentioned above may point to whether the site is sending it as plain text instead of HTML.
Thanks,
Peter.