Is there a way to globally disable the automatic sending of the welcome email? We'd potentially like to invite only specific users to use the mobile or desktop client, and don't want the email sent automatically.
Hi,
Yes, you can disable it from Settings page.
Login to 3CX Management Console and go to Settings->Email page and navigate to Notifications tab.
Here you can disable the "Notify user when extension is added" feature from the Events list and press OK.