@sandrovenezuela was the function removed? I didn’t even notice.
Something else you can do is create a custom field called campaign-xy-entry with type date. In the campaign, as first action, you set your custom field to “now” without “”. Before sending the email you add a condition campaign-xy-entry is before [date-last-send] and route all following mails. This way you can skip whole blocks of emails. But the approach won’t work, if the contact is already inside the campaign.