Set up email sending through Microsoft 365 using SMTP. Optionally, add an SPF record if needed. This lets users send emails from the system with their own Microsoft 365 mailboxes.
In the Microsoft 365 admin center, enable SMTP AUTH for every user who should send emails from the system.
Open the Microsoft 365 admin center and go to Users > Active users.
Select the user, and in the flyout that appears, select Mail.
In the Email apps section, select Manage email apps.
Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
When you're finished, select Save changes.

In the system, go to Settings > Account > Profile. Enter your organization’s SMTP server details.

For every user who should send email from their own Microsoft 365 mailbox, in Omikai open the user in Settings > User and enter the Microsoft 365 username and password for SMTP.

If you also enter an SMTP login and password in Settings > Account > Profile, these credentials are used only as a fallback when a user does not have user-specific SMTP settings. This step is optional.

If Multi-Factor Authentication (MFA) is enabled in Microsoft 365, you may need to add an SPF record for the system’s email service: