On Monday, December 30, an email delivery issue affected messages sent to CU Boulder email accounts (faculty, staff and student accounts) from 10:09 a.m. to 11:13 a.m. Emails sent to an @colorado.edu address from an external service (e.g. Salesforce, DocuSign, Slate, Google Docs, etc.) or from outside of the CU Boulder Office 365 or CU Boulder Gmail systems (e.g. personal accounts, other universities, governmental organizations, etc.) were not delivered.
Here are more specific examples of the impacts:
Impacted
- Emails sent from external accounts to CU Boulder accounts were not delivered during this window of time.
- Emails sent from a CU Boulder Gmail user to a CU Boulder Office 365 user were not delivered.
- Emails sent from a CU Boulder Office 365 user to a CU Boulder Gmail user were not delivered.
Not Impacted
- Emails sent from one CU Boulder Office 365 user to another CU Boulder Office 365 user were delivered correctly.
- Emails sent from any CU Boulder Office 365 or CU Boulder Gmail user to an external email address were delivered correctly.
The root cause of the email routing issue was repaired and email started routing correctly again as of 11:13 a.m. on December 30. Impacted students, faculty, and staff were sent targeted messages which included the subject lines and senders of emails that failed to deliver to their inboxes with the advice that they contact external senders and ask them to resend the emails.
