I'm using the great Wysija plugin for 2 weeks already.
In the firs time he send out the single newsletter i have, it sends multiple copies (2 or 3 times) to the same person! it was very embarrassing. i check the setting and it was on "SMTP" (via Gmail).
So i change it to "From your server" via PHP mail. it was fine for more then a week, but now it happens again and it send to my list 3 time's the same email. i checked the settings, and it still sending with my own server via PHP mail.
What could be the problem?