On Wednesday 2017-03-08 from 13:00 UTC till 15:00 UTC, the VM that hosts the openSUSE Mailing lists [1] will be offline. During that time, sending or receiving mails to the openSUSE mailing lists, or viewing their archives will not be possible. All the mails that will be sent during the downtime will be delayed.
The reason for the downtime is to apply major upgrades to both the operating system and the mailing list software.