[Resolved] IMAP/POP service access issues

We are currently experiencing issues with access to our IMAP and POP services and are investigating these.

UPDATE 02:30 CET (8:30 PM EST, 5:30 PM PST)

After restarting the IMAP/POP services on all relevant servers, access is being restored and operations are normalizing.

UPDATE 03:00 CET (9:00 PM EST, 6:00 PM PST)

The issues affecting IMAP/POP services have returned and we are continuing investigations in order to resolve the problem. We apologize for any inconvenience caused.

UPDATE 03:15 CET (9:15 PM EST, 6:15 PM PST)

We have restarted all IMAP/POP servers and this appears to have resolved the problem, which was likely caused by cascading issues from a transient network file system problem.