Hii, Since I started playing around bit with hourly quota, lowering my speed a lot basically. My campaigns will suddently become stuck at sending x %... If I manually pause, and start again it will work.. For some reason. I've seen this error on many of my campaigns: 2018/12/22 14:13:01 [error] [application] Cannot find a valid server to send the campaign email, aborting until a delivery server is available!Campaign UID: yf690kw2nve98 Just to make it clear, the delivery servers are still present on the same customer. I've never had these issues when my hourly quota was a lot higher.