Greetings: This notification is being sent to the general community at the request of the IAOC. Yesterday the IETF experienced a 5.5-hour service outage on its Mailman list processor, beginning at approximately 1530PDT yesterday. In this failure, Mailman started dropping messages, rather than bouncing them, as it should have done. AMS received alerts from IETF members that mail was not flowing correctly. Following the initial alert, AMS staff logged in to the system, and were able to analyze the problem and effect resolution. Mailman service was restored and verified. Because of the nature of this outage, AMS was not, unfortunately, able to recover the lost email messages themselves. We searched the mail logs, and sent notifications to all the senders that he was able to locate in the log during the outage period, asking those individuals to resend their email messages. Service has been up and running continuously since 2100PDT yesterday, and no further outages have been observed. No other services were impacted or interrupted during this time. The point here is that if you sent email messages to IETF lists during the outage period, they were not processed, and should be resent, to ensure proper delivery. I remind everyone that AMS - the IETF Secretariat - is always reachable at "ietf-action@xxxxxxxx", and I encourage everyone to contact that address when there are problems. Emails sent there are tracked by the IETF's ticketing system, and reach the AMS IETF IT Staff directly. If mail itself is the issue, our out-of-band webform at http://www.ietf.org/contact.html as a backup method of contact. Note, however, that neither I nor members of my staff are generally on *this* list, so emails sent to this, the general IETF discussion list, will only reach us after many delays, if at all. Please note and keep a copy of the correct addresses to use to reach us, shown above, if you need to. Thank you for your patience during this outage. Glen Barney IT Director AMS (IETF Secretariat)