(minor, although a wee bit annoying <smile>)
I'm still getting multiple automatic update emails (7 at last count) for my site. I'm actually getting this for more than one site as well, but for this issue, I'm only mentioning one website.
I recall that this was mentioned as fixed in a previous release, and for most sites, I've gone in and selected a single super admin to receive update emails, etc.
On this site (hymla.com), there are 3 super admins. I am getting multiple emails to a single email account. Times of receiving (local to India at +5.5 UTC) 8:39 am 8:44, 9:01 9:14 9:21 9:44 10:40.
Two of those admins ultimately end up in my email account, but I would have expected two emails in that case.
Akeeba Backup Update Check plugin is active and "Super Admin email" field is blank.
And, by the way even after putting in new download ID, it still fails auto update to 3.10. (I've read your response to another that this should be fixed in 3.10, but I also read another response saying it only needed an update to the download ID. So, I thought I'd mention that updating the download ID by itself didn't fix the auto update in 3.9.2
I was also surprised that I didn't get any emails about the download ID change.