To deal with an as-yet unpublished security vulnerability, server NC026 will undergo emergency maintenance today (1 October) starting shortly after 15:00 UTC. Down time should be brief, but will be noticeable for websites hosted on this server during the maintenance. Most of the websites hosted on this server are newer ones using more recent versions of WordPress. If you are not sure whether or not your website is hosted on this server, you can contact support to find out.
No email is hosted on NC026, so this maintenance will not affect email flow at all.