Since i updated Newsletter plugon to its latest version, I can’t edit my templates in HTML anymore instaed of wysywig (the page load, I can see html editor for a few seconds and the wysywig comes back).
Also, i tried to put css in theme.php files with <style></style> in the header. it shows up correctly in the wysywig, but when i send the email the style code disapear 🙁
I just have the same problem. I did myself a custom newsletter with an own css. In the editor it looks great. But if I send a test Email to googlemail (I know of their css-substraction) and Outlook, the newsletter isn’t been shown with css-styles. But if I just call the URL of the /wordpress/wp-content/plugins/newsletter-custom/themes/mytheme/theme.php it is shown in a perfect View.
I just set the absolute path of the specific style.css into the theme.php.
Could you imagine, where I have to find the error?