Every time I try and send an email, the first group of 60 goes out fine then MBM counts down 4 minutes and then displays "Next Delivery in 00:00:01" and then it does nothing. If I click stop and then click start again the next group of 60 goes out and then hangs again after the 4 minute interval. Any ideas would be great. Looking at the logs it seems that MBM doesn't fully disconnect from the smtp server in between intervals. When I click the stop button I can see it fully disconnects and then I am able to send the next group -- only after clicking the stop button.