At this time, only a Parent's primary email will be pulled in when a teacher is bulk emaling her class. A lot of parents have 2 email addresses they would like this information to go to. You can add a "cc" email in there, but that does not pull into the bulk e-mail lists.
We keep running into this issue. A lot of our parents have assistants who handle scheduling. When they do not receive the information going to parents there is much confusion. Please, please add this to your next update!!
This would also be helpful for community and activity groups. CC emails should always populate as such, not just for PushPages.