Hello, I had to revert to version 6.8.9 of the newsletter plugin for it to work again, so the problem seems to be with version 6.9.0 onwards! Hope there aren't any security issues for now.
@hsupyaenaung @stefano
Hello,
I'm having the same problem! What can we do to fix it?
Unfortunately I only noticed it a few days ago, haven't had new subscribers in a while because of this.
@stefano