Glossary
Email Authentication
Also written: SPF DKIM DMARC, email sender authentication, domain authentication
Quick answer
What is email authentication?
Email authentication is a set of DNS records — SPF, DKIM and DMARC — that let receiving mailbox providers verify a message genuinely came from your domain and was not altered in transit. Without them, automated mail is far more likely to be filtered to spam or rejected outright.
Three records, all published in DNS, each answering a different question.
SPF — who is allowed to send
Sender Policy Framework lists the servers permitted to send mail for your domain. A receiving server checks the sending IP against that list.
The most common failure is the ten-lookup limit: chain enough include: statements and SPF
evaluation fails, which is worse than having no record at all.
DKIM — was it altered
DomainKeys Identified Mail attaches a cryptographic signature to the message. The receiver verifies it against a public key in your DNS, which proves both origin and that the body was not modified in transit.
DMARC — what to do when a check fails
DMARC ties the other two together and publishes your policy: none (monitor only), quarantine
(send to spam) or reject. It also enables reporting, which is the only way to discover who is
sending as you.
Start at p=none, read the reports for a few weeks, then tighten. Publishing p=reject before
you know every legitimate sender is how a company blocks its own invoices.
Why this is not optional any more
Google’s bulk sender requirements require SPF, DKIM and DMARC for senders above their volume threshold, along with one-click unsubscribe and a complaint rate kept under 0.3%. Yahoo published equivalent rules. Automated CRM mail sits squarely inside scope.
Related terms
- CRM AutomationCRM automation removes manual work from customer relationship management by automatically creating and updating contact records, moving deals between pipeline stages, triggering follow-up sequences, assigning tasks and notifying team members, based on defined triggers rather than someone remembering to act.
- Lead NurturingLead nurturing is the practice of maintaining useful contact with prospects who are not ready to buy, through sequenced messages and content over weeks or months, so the business remains present and credible when the buying decision is eventually made.
Services that use this
Make sure the messages you automate actually arrive
Automated messages fail to deliver most often because the sending domain is not authenticated with SPF, DKIM and DMARC records, because a new sending domain or number was used at high volume without warm-up, because sender reputation has been damaged by complaints, or because required carrier registration was never completed.
GoHighLevel setup, configured around how you actually sell
GoHighLevel setup is the initial configuration of an account: creating pipelines and stages, custom fields, calendars and booking rules, core workflows, forms and funnels, connecting phone numbers and email domains, completing messaging compliance registration, and integrating the platform with the other tools a business already uses.
Fix the thing that stopped working
GoHighLevel automations commonly stop working because a trigger condition changed, an integration disconnected or its credentials expired, a required field was renamed, messaging delivery was blocked by missing compliance registration, or another workflow is exiting contacts before the sequence completes.
Ready to put your growth on autopilot?
GoHighLevel, AI agents, CRM automation and workflows — engineered around how your business actually operates.
Free · 30 minutes · no obligation