Many thanks for that. I’ve been (slowly) reviewing my 20 year (over 900!) back catalogue of server-side spam filters, disabling ‘generic’ ones for eg X-Spam-Score & UTF-8. So far, still no Ebay email notifications (Saved Search & purchase / shipping updates). Thinking either Ebay now includes some extra ‘security’ coding in their emails, else my server provider’s filters have very belatedly kicked in. As is, I still can't change or even re-verify my existing email address for Ebay I’ll persevere for now. (Back to daily searches & using the couriers' tracking thus.)