University of Cambridge Computer Laboratory - Some mail into Fastmail is bouncing – Incident details

All systems operational

Some mail into Fastmail is bouncing

Resolved
Operational
Started about 1 month agoLasted 8 days

Affected

Fastmail email

Third Party: Fastmail → Mail delivery

Updates
  • Resolved
    Resolved

    We have not seen any reoccurrence of this issue since 2024-07-22 at 14:20, which coincides with when Fastmail fixed another problem, so we hypothesise that they fixed this one too by accident. However they are continuing to investigate.

  • Monitoring
    Update

    Fastmail has clarified that they have fixed only one of two issues that we reported, and it may be the case that mail continues to bounce with "bare <LF>" errors. We are in communication with Fastmail engineers to investigate the remaining problem, which appears to be a complex software bug. Nevertheless mail has not been bouncing for the past 21 hours so the problem may have been fixed by accident.

  • Monitoring
    Monitoring

    Fastmail has now confirmed that they have implemented a fix for the problem.

  • Investigating
    Update

    We have still not heard back from Fastmail, but mail seems to have stopped bouncing around 14:20 yesterday. We will continue to press Fastmail for an update and will continue to monitor the situation ourselves.

    If you are a Fastmail user and would like us to check our logs for any mail to you that bounced, please contact service-desk@cl.cam.ac.uk.

  • Investigating
    Investigating

    We are aware that Fastmail are bouncing some mail to users of fm.cl.cam.ac.uk with an error message such as "Error: bare <LF> received". We will ask Fastmail to investigate.