Common Authentication Issues & Myths

Understanding your "digital signature." DKIM proves two things: 1) The email really came from your domain, and 2) The message (body and headers) was not tampered with in transit. It's the "captain's wax seal" that guarantees the cargo is authentic.

14 questions in this topic

Does SPF improve deliverability by itself? Does DMARC guarantee inbox placement? Can you use multiple DKIM signatures? Why does SPF “neutral” still show as pass sometimes? Can you authenticate using a free domain? Do authentication records affect open rates? Why do some mailboxes ignore BIMI logos? Is authentication required for cold email? Is authentication the same as encryption? Why do Gmail and Yahoo enforce authentication for bulk senders? Can you have SPF and DKIM pass but DMARC fail? Does authentication help with brand protection? What happens if a domain has no MX record but has SPF? How do custom return-paths affect SPF?

Questions about Common Authentication Issues & Myths