I just logged into the list itself and sent a test message that seems to have distributed, but ISED has been unusually quite. But I didn't try a test message by emailing the list.
I tried emailing the list last Thursday or Friday and it did not go through. I got a message saying the list was being "held".
Was just about to go in search of others with the same problem. No messages from them in a few days, but they're not getting held up as spam and my subscription is still good.
I tried posting something on Saturday by logging into the list itself and got this message:
The distribution of your message dated Sat, 21 Apr 2012 09:12:18 -0400 with subject "Wireless Network Guest AUP" has been postponed because the ISED-L list is held. No action is required from you. Your message will be reprocessed automatically once the list owner releases the list.
Occasionally, when the volume of ISED is high, the list host turns off the list until we get to it and re-engage. It took us a bit longer to to this than usual.