We had 2 hours of downtime today that was caused by electrical problems that took out our Top of the Rack switches.
The problem was between 14:00 and 16:00 and was fixed by an electrician at the data center.
We are very sorry about the problems this caused for our users and we will be looking at ways to avoid any similar event in the future.
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UPDATE: After the power outage one of the spam filter servers did not restart as it should have, causing some spam to not be caught. The server is being restarted now and spam filtering should return to normal shortly.