Students are struggling this year to access courses. They are not receiving course invitations, even if I resend them or create new courses to send from. I get the message that the emails are not verified. The students are not getting verification emails either.

Our IT department disabled the student emails for a period of time over the last week or 2. I suspect that the email invitations may have bounced back. Would this put the emails on an inactive list or suppression list on the canvas end? If so, how do we get them back off?

The courses are published, the emails are correctly entered and I've not had problems with our institution emails before. This is a free account.