Email Deliverability: SPF, DKIM & DMARC
Authentication basics for small businesses—what each DNS record does, how ESPs use them, and when to bring in DNS help.
Last updated: March 29, 2026
Start with your ESP’s checklist
Platforms like Mailchimp, ActiveCampaign, and Klaviyo publish the exact hostnames and values—compare vendors on our best email marketing software page and Mailchimp vs ActiveCampaign.
Why this ties to compliance and trust
Pair technical setup with consent and CAN-SPAM basics. For list growth discipline, see how to build an email list.
Operational verification
After DNS propagates, send tests to major providers and monitor bounce reasons. BeltStack does not provide legal advice—verify records with your ESP and IT vendor against current documentation.