We've seen the same thing at our high school.
Distribution list:
wholeschool@school.org- classof2013@school.org
- classof2012@school.org
- classof2011@school.org
- classof2010@school.org
- facstaff@school.org
Each of the classes get the message, but nobody in
facstaff@school.org does.
The total of the first four lists is ~1050 users, with an additional 175 in facstaff. We're receiving no error messages, and the students all seem to be getting the announcements bulletins we're sending out via this list (though it's impossible to say; it could simply be that no students have reported any problem).
Any help on this would be fantastic.