Hi, first of all great plugin! It’s really usable and loaded with features.
I’m currently using it in a Spanish website and I have found a problem with special characters codification, if you use special characters as in Spanish “ñ” or “é”, etc. they will appear wrong in the final generated form.
I have temporarily fixed it by replacing the function htmlentities() with htmlspecialchars() in lines 84 and 224 of file wpnewsman-newsletters/class.form.php
Thanks for pointing to the bug and thanks for the fix although I need to make some checks to include it into the release. Could you tell me what php version you use, and what charset is on your pages? How do the characters look like after the wrong transformation?