Okay, will do. Thank you for taking the time to look into this!
Interestingly, I do have some more information to share with you:
1) All of the emails I listed above were sent at or within just a few minutes of 5 AM on Saturday, August 15th. For completeness, I did receive one more RAID Maintenance Complete email at about 10:29 AM that morning, to indicate completion of all the started jobs, but I don't believe this is important. What I think is important is the 5 AM time on Saturday.
2) I have not received any additional emails since last Saturday.
3) In the Admin web-based interface, I discovered that the page Disk Management > RAID Setup has a section for RAID Scanning Setting. This section indicates a RAID Scanning Schedule of EVERY WEEK ON SATURDAY AT 5 AM. I'm guessing that this must be where the notifications are coming from.
So, in conclusion, this seems to be a bug of sorts, since it would be nice to be able to continue the RAID scanning as scheduled without the unwanted notifications, but in all fairness I must concede that this is much less of a problem that I thought it would be.
Thank you!