We will performing a software update and reload of our email servers at 7AM on Thursday 7th November. This is to fix a problem with sieve filters not being replicated across our cluster. We don't expect this to take very long and most email clients shouldn't notice or be affected by the reload.
The servers have been updated and we're monitoring them closely.
We've verified that sieve filter sync is working as it should again. This planned work is complete.