2017-07-25 22:21 UTC: a filesystem issue on one of our POP/IMAP proxies is disrupting mail service for some customers. We’re working to restore service and will update this post when more info is available.
2017-07-25 23:09 UTC: The faulty mail proxy is back online. We’ll continue to monitor.
2017-07-27 21:15 UTC: We’ve seen no further issues with the POP/IMAP proxies.