Yesterday, it came to our attention that a large number of mailing lists (~200) hosted on our Mailman server had been inadvertently misconfigured last week; and as a result, were not accepting new email messages. We determined there were ~60 email messages sent to 18 affected lists during the outage. Email messages sent to those lists were not queued or delivered, and the sender received a bounce back “Delivery Status Notification (Failure)” message indicating a “User Unknown” error. Currently, we are contacting the affected list owners as well as senders.
Please accept our apologies for any inconveniences caused by this unfortunate error. We consider email delivery a top priority as we know it is a vital communication channel for the College.
Messages to some mailman mailing lists are bouncing.
WHEN IS IT HAPPENING?
Discovered at 3:45 PM, October 15, 2014 and ongoing.
WHY IS IT HAPPENING?
TSO is currently investigating and will update as more information is available. Affected users will receive bounce notifications from affected lists. Unfortunately, any bounced message will need to be resent once the issue is resolved.
WHO IS AFFECTED?
Any faculty, staff, or student trying to send messages to the affected lists.
Mailman mailing lists.
WHAT DO YOU NEED TO DO?
No user action is required. If you receive a bounce notice when sending to a mailman mailing list, please forward to us at firstname.lastname@example.org.
WHO SHOULD YOU CONTACT FOR QUESTIONS?
TSO Help Desk (CCB 148, 404.894.7065, email@example.com).