Hi, I am having this problem, I only get a plain text test email, and page goes blank everytime I try to send any kind of mail from the plugin.
I have been using Newsletter plugin to get subscribers and to send newsletters with good success, until a couple of weeks, when it stopped working at once.
When I try to send any type of email, the page gets blank, no matter what parameters I introduce in the panel.
I am using Gmail SMTP, but I had this blank page problem even before I installed...
My memory is set to 128 MB (I read that short memory is the problem often...
Any ideas, please? I am desperate, of course I can use other plugins for this but they are no by far as nice 🙁
Thank you!