If users encountered any email delivery failures this morning when sending messages from any @missouri.edu primary email domain to external recipients, the issue was likely related to an invalid DNS entry that required correction this morning. Specifically, an invalid DNS record was mistakenly created for two SPF records associated with the missouri.edu domain. This misconfiguration may have sporadically caused external recipient servers to reject emails, resulting in hard bounce failures.
The networking team has since resolved the DNS issue. However, anyone affected should only have resend only the emails that failed. If a failure occurred, the sender would have received a non-delivery bounce message back in their inbox. Users can click on the bounce message and select “resend message.” If no failure notification was received, users do not need to resend any messages, as those messages were successfully delivered.”
