The email servers are being upgraded over the weekend to a pair of faster mirrored servers. During the course of this migration email will appear to have disappeared from in-boxes but this isn’t any cause for concern and is merely a side-effect of the migration process
No email has been lost – it is in the process of being synced. During the course of the weekend the email should fully re-appear.
New email will be delivered instantly – older emails will be restored as the sync process progresses. Any security certificate error messages can be safely ignored for the duration of this migration. These will disappear after both servers are fully synced and updated.
We will confirm when this process has completed.