digest sent to entire list, why?

Hi,
I'm running 2.0.11
One of my new lists sent the first digest to the list posting address today from listname-admin@hostname.tld 'on behalf of' listname-request@hostname.tld to listname@hostname.tld
Coincidentally(?) the time stamp matched that of a post I had approved and which was sent at the same time as the digest. It was a simple plain text post I'd approved (mime is disabled for the list in question.)
My impression had been, from the digest settings I'd chosen in the admin webgui, that the digest would only be sent to list members who had opted to receive the digest instead of separate posts. I'm baffled by the digest having been mailed to the list posting address and therefore all members of the list. (and a thought which just came to mind, will the digest be included in the next digest since it went to the list address? ug.)
I've searched the admin webgui settings and found nothing, I've read the readmes and found nothing, I searched http://www.python.org/cgi-bin/faqw-mm.py with all the strings and search types I could think of and came up with nothing. I browsed through the TOC there and found nothing.
What am I overlooking? How do I prevent the digest from being sent to the entire list via the list's posting address? I had 7 unsubs within 10 minutes of that going out, so I'd like to prevent a repeat.
tia, ~steven
participants (1)
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Steven Shults