Just sent test email to you.
I’ve been through the permalink error before (it warns you) and then I’ve worked it out and it shows OK in my browser and the link works (everything works at test email).
I’ve tought that this could be something related to GMail conflict and created a SendGrid account, linked Postman to it, tested OK with no avail. Everything works, all mails are sent, test newsletter is sent but the real newsletter isn’t.