UPDATE: One of our outgoing mail servers has become overloaded. Currently the issue has been resolved and customers should no longer have problems sending out email with the below errors. Again our apologies for any inconveniences you may have experienced.
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Currently users find they are unable to send out mail with an error:
[Mail not sent. Sending error: 452 4.3.1 Insufficient system storage]

This has been occurring for the past 45 minutes, we are working to resolve the issue as soon as possible. Our apologies for the inconveniences this may have caused.

Currently trying to diagnose the problem, will update this page when we have an ETA or when the issue has been resolved.