I hope you are well. We tried the plugin and after the first successful mailing attempt we did purchased premium license, since we think it’s a great effort.
Though after we prepared a second newsletter we do get a persistent error message ”The scheduler is overloaded or a job has fatal error and blocks the scheduler”
We did tried to reset the sending procedure, we did tried to use your external cron job trigger, but we still get the same result.
Please help us as soon you can we have a certain campaign in progress.