How do DKIM and DMARC affect email deliverability?

Originally published at: How do DKIM and DMARC affect email deliverability? - Lightmeter

Who cares? Many mail hosts, local and global, large and small, urge senders to set up DKIM and DMARC as soon as possible. Combine that with the public adoption of these email authentication systems by almost all the major global ISPs (and offering their clients with the ability to set them up, backed by numerous…