MTA restrictions not working (part 2)

Hello everyone!

When disabling the option "Reject if the username is different from the authenticated one" in the Carbonio AdminWeb interface (latest version), the change doesn't take effect — the behavior remains as if it’s still enabled. I checked the zimbraMtaSmtpdRecipientRestrictions configuration and it was empty, although it previously contained reject_sender_login_mismatch. However, in the file opt -> zextras -> conf/zmconfigd -> smtpd_sender_restrictions.cf the option is still present:
permit_mynetworks, reject_sender_login_mismatch.
To make it work as expected, I had to manually remove the reject_sender_login_mismatch line from that file and restart the MTA. After that, it worked properly.
Is this a bug?

Regards,