Be careful not to hit "Refresh" when sending email and coming back to resume sending. It is also fairly important on some servers to not hit Resume until you verify that the messages are not still sending in the 'background'. You can do it like this: When a mailing stalls, close the window and re-Login to ListMail. You should see a queue entry at the top of the page with a certain # of messages 'remaining'. Now, browse to another ListMail page. If the number of remaining messages decreases, it is not a good time to Resume your mailing. I will be implementing some checks for resume/refresh issues in the near future to prevent undesirable operation.