We had problem on our client. We fixed it
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scheduled down for system maintenance

System maintenance will be performed on Sunday, November 1, 2015 01.00p - 02.00p UTC.

System affected by possible downtime: POP, IMAP, SMTP, CalDAV/CardDAV and WEB
Short downtime might happen on Sunday, November 1, 2015 during the maintenance window, between 01.00p and 02.00p UTC.

Incoming emails will work as normal due to the server.