I've sent Jira/Confluence invitacions to eight programmers/designers, both to their company email addresses and to their Gmail addresses. Of the eight, only three have received their invitations. I began this process on Friday and we are still not able to use Jira for task management because of this apparent problem in the Jira email system. They have all checked their spam boxes (which is unlikely as the source of the problem, since I've sent the invites to two different addresses for each person). Also, they are physically located in three different locations on different email/DNS servers, so that is not the problem, either.