Message No.: 201803061600
Time: Mar 18th, 2018, from 9:30 a.m.
Affected: all Exchange users
Impact: Temporary interruption of e-mail traffic
In order to introduce software corrections and to improve SMTP security, system maintenance in the Exchange environment is scheduled for Sunday, Mar 18th, 2018, starting at 09:30 a.m. After the maintenance window sending with unregistered e-mail addresses will be disabled for authenticated users (sending without authentication is generally not possible). If you have any questions about this, please contact email@example.com and we will be pleased to answer your questions.