when publishing a new issue, an automated e-mail is sent to all signed members. How can this be disabled?
see discussion here: Make notification emails for new announcements and issues optional in OJS3.0.2
so, this means this function cannot be disabled at the moment?
If you change your settings to “OJS is not used to publish content” the emails should not be sent. After publishing an issue, you can change that setting back.
Otherwise, you would have to edit the core code to make the changes. I forgot to do a ticket to github about the feature, I will add it today later, maybe during summer I will have time to contribute to the feature, but the decision if PKP wants it there is up to them of course.