I'm guessing maybe not everyone realizes this...but sometime in the last year there has been a glitch with sitemails.
There is a nice feature (well, it used to be a nice feature) available to league commissioners. On the home page of the league, up at the top, right under the theme description, there are a set of tools, some of which are only available to commissioners. One of them is "sitemail league owners." This is very convenient because you can send one message to everyone, and you don't have to keep track of everyone's user names and manually enter them, or worry about typos, etc.
However, and this is the point of my post, sitemails sent that way do not trigger any alerts to the recipients. Sitemails sent the normal way provide two alerts:
1.) A tag appears next to the little bell in the main menu bar - alerting you that you have unopened sitemails.
2.) Provided you have activated the feature, WIS also sends you an email alerting you to the sitemail.
Importantly, NEITHER OF THESE THINGS HAPPEN WHEN YOU USE THE "sitemail league owners" FEATURE.
Meaning unless an owner manually goes into sitemail and checks, he will never see it. Worse, as there is NO indication that an unopened sitemail exists, he has NO REASON TO CHECK. If you are wondering why owners are not responding to you, this is the most likely reason.
I strongly recommend NOT USING THIS FEATURE.