Outgoing email

We don’t want emails to be sent to contacts on case activity. We had an instance in which the person associated with a contact received an email when a ticket was closed. This has only happened one time recently, but we wanted to follow up on it.

Under “Advanced OpenPortal Settings” have have all of the templates set to “none”.

Can anyone suggest another setting to check to make sure that emails don’t go out to the Contacts unless we explicitly send?

Thanks in advance for any advice.

One new detail: It happens on case edit.