we inform you that, in order to provide an ever improving quality of service and performance, on Thursday November 28, 2019, from 6:00 until 6:30 a.m., a planned maintenance of the webmail servers infrastructure is scheduled. During this operation, a webmail interface will be temporarily unavailable. You will still be able to login into your mailbox using IMAP or POP3 desktop and mobile email clients. In case you are using only webmail, you can configure any desktop or mobile email client with your IMAP account. For more information please read this article
This maintenance won't have any influence on delivery of the incoming post or sending messages from email clients.