Update: The maintenance has been rescheduled for Thursday the 26th of September.
As part of the ongoing migrations of Linux Shared hosting infrastructure to new Operating Systems webmail will be unavailable between 06:00 – 08:00 AM on Thursday the 26th of September 2019.
What is impacted?
The following URLs will not be accessible during the maintenance window
http://webmail.blacknight.com/ and https://altmail.blacknight.com/
Mail delivery along with POP3 and IMAP access will not be impacted.