So if you know each e-mail address that is being returned then you should know how many right? It sounds like you do, but you really want to check the exact pieces of data, and not just the count. I guess you must be more detailed than I am ;-)
If that is the case, you could try concatenating each of the text nodes together and making your Expected Result a string with all of the data across all of the nodes. This will only work if you know exactly how many things are coming back. For example, if you know that there are going to be 3 nodes in your result you could try something like this...
concat(//ns2:return/ns3:channelStatus[1], //ns2:return/ns3:channelStatus[2], //ns2:return/ns3:channelStatus[3])
Again, this might not be a perfect solution...I'm just learning XPath myself, but maybe it is close enough to get you through this?