Over the next few nights we will be performing maintenance on the SMTP and IMAP/POP3 servers. This is to get it ready for some new features we'll soon be rolling out. (We're keeping the new features a secret for now, but announcements will be made over on the main blog
when they're rolled out). During the maintenance, the SMTP and IMAP/POP3 servers will be intermittently unavailable. You may also occasionally get "incorrect password errors".
During this change we don't expect any mail to be lost, but it might be delayed. The work will be done between 9:00PM, and 1:00AM over the next few nights. I'll make an announcement here when all the work has been completed.