On Sunday 24th July 2011 starting at 5pm GMT we will be adding HSM storage to the zimbra-mbox1 server.  Any mailboxes on this server will be unavailable for the 10 minute duration of this maintenance window.  Emails arriving during this maintenance window will be queued and delivered once the mailboxes are available.

Maintenance Start: 17:00 (GMT) 24th July 2011

Maintenance End: 17:10 (GMT) 24th July 2011

Queued email is being delivered to the affected mailbox server now.

Rest assured that any legitimate emails sent to you during this incident would not have bounced or been lost - simply delayed. This is because of our multi layer architecture: External spam/virus servers handle initial receipt and if legitimate, forward to Zimbra MTA servers which in turn deliver to the appropriate host mbox server. In this case, all email was held on the Zimbra MTA servers during the problem with mbox3.

12:38 All clear update - all queued emails have been delivered. Please accept our apologies for the inconvenience caused.

We are currently investigating why email is being queued on one of our Zimbra mailbox servers - mbox3. We will post an update shortly.

12:23 - Update.

We identified some hung connections which stopped this mailbox server accepting any new email. We had to restart the affected mailbox server and we are waiting for load to stabalise before we enable mail delivery.