Carnegie Mellon University School of Computer Science
August 27, 2025

SCS Email Delays 8/27/2025

Intermittent delays/bounces for email to CS.CMU.EDU addresses

This event has expired. Its previous status was Ongoing.

SCS Email Delays

DATE: 8/27/2025

TIME: 2:45 PM

SERVICES AFFECTED: Email to CS.CMU.EDU Addresses

DETAILS:

Following a report of delays and bounces for email to CS.CMU.EDU email addresses, we identified a flood of automated messages coming from an external service provider. Once the source of the traffic was confirmed, we engaged with the service subscriber to end the traffic flood. The bulk of the messages stopped coming in at 4:05 PM and related traffic was last observed at 6:39 PM.

We believe incoming email to CS.CMU.EDU addresses is functioning normally now but are continuing to monitor the service with a higher level of attention.

Note: This incident did NOT impact delivery to ANDREW.CMU.EDU email addresses.

Have questions?

Please contact the SCS Help Desk at 412-268-4231 or email help@cs.cmu.edu.