Hello, First of all, thank you so much for your message. Yes it is exactly what I want, I want to send e-mail to my customers in order to inform about maintenance. - Ok, so if I understand what you said, it is necessary to develop our own plugin for OTRS if we want to do that. or - Show a message for my customers on the login page of the OTRS platform. Is it true ?Thanks again. Regards,Romain