thank you for this great plugin.
Since a month i'm experiencing a problem in one of my website where i run knews plugin on wp 3.5.1. Everywhere else it works fine but in this one (www.plindo.com) sending became really slow... I've been using this plugin for long time and everything was just perfect (always using wordpress CRON, even on the other websites).
Since a month it takes weeks to send the same newsletter (about 6500 contacts i was used to reach in 2-3 days) and i also get thousands error on the report page.
The same plugin on my other website works fine.
I tried to uninstall and install it again but nothing changed.
I also tried to use my webserver CRON but everything's just the same.
What can i do?