One of the things upgraded this morning in POA HF02 was courier-imap on the qmail cluster machines. Seemingly there's an issue currently with IMAP, pop3 remains working at least. We're investigating the IMAP issues and we'll hopefully have a resolution sooner rather than later.
This applies to all IMAP connections made to mail.blacknight.com
Update: 11:12am
Webmail + IMAP should be back now. We don't know why this issue cropped up this morning, but it looks to be related to the nfs servers clock being off by 4 minutes and IMAP doesn't like the time skew. We've setup ntpdate to run every day on the NFS servers now so this problem shouldn't reoccur.
This applies to all IMAP connections made to mail.blacknight.com
Update: 11:12am
Webmail + IMAP should be back now. We don't know why this issue cropped up this morning, but it looks to be related to the nfs servers clock being off by 4 minutes and IMAP doesn't like the time skew. We've setup ntpdate to run every day on the NFS servers now so this problem shouldn't reoccur.