If you are going on holiday or are ill and cannot or do not want to be reachable by email during this time, an automatic reply with an absence note is useful so that your contacts do not have to wait unnecessarily long for an answer.
In the user settings for emails , you can set up an out of office note for the onOffice mailboxes that are assigned to you.
In the basicemail settings that you call up via set up the out of office note for all onOffice mailboxes on the “onOffice mailboxes / external POP3 mailboxes” tab. This can only be set by administrators.
For other, external mailboxes, please use the mailbox administration at the corresponding provider