howto configure or change My Origin

Using the latest Carbonio CE on Ubuntu server 22.04, migrated from Zimbra 9.

The domain that was initially configured, for the installation of Carbonio, came out warbled, so was later deleted.

However, the My Origin , listed under the MTA - Outbound flow settings, is still set to that inital (nonexisting) domain, hence all the bounced emails are not being delivered (and make it really hard to troubleshoot).

I am able to put something else in the text field, but there is no Save button.

Is there a zmprov command to change the My Origin name?

Any pointers much appreciated.

Best regards,

r u b e n