In the "Company > E-Mail Server" menu you can activate "Own e-mail server (SMTP)" and enter the following data:
E-Mail Server: smtp.office365.com
User name: Your Office 365 email address
Password: Your password
Server requires SSL encryption: active
Important: First click on "Test your settings" and then click on "Save changes"!
In addition, you must go to Active users in the Microsoft 365 admin center and select the relevant user there. On the Email tab, go to Manage email apps. There you enable the Authenticated SMTP option.
If you have created several calendars in eTermin with different email addresses, please note the following:
Since you can only authenticate an email address in eTermin when setting up your own server, all other email addresses in Office365 must be enabled so that the authenticated address can send emails on behalf of the other sender addresses or in general.