We will be taking one of our customer facing mail servers down for a rebuild on Tuesday the 25th of April. We will be moving its IP addresses over to an alternative server to keep disruption to a minimum. Once we are happy with the rebuilt server we will put it back into service. This may be the next morning, depending on how long it takes to test the rebuilt server. Although disruption should be minimal, please consider IMAP and POP3 services "at risk" during this time.
The rebuild mail server is in service and operating normally.