We're looking to secure our email domain reputation by changing DMARC settings so email providers receiving an email that spoofs our domain will automatically reject it.
If you use an email forwarding service that strips the original headers of an email, then you may stop receiving the newsletter. This is most likely to happen if you forward from a work domain to Gmail or a similar primarily web-based email provider. It's not a standard behaviour, so hopefully very few people will be affected, but under certain circumstances Outlook can do it.
Changing your email address on SSC to the one you want to receive email at should resolve this, as without forwarding the service provider can authenticate the email directly.