Email Authentication (SPF, DKIM, DMARC) — Quantum Growth Agency
[ 02 // EMAIL_AUTH ]

EMAIL
AUTHENTICATION
& DELIVERABILITY

SPF, DKIM, DMARC, and BIMI — the four protocols that determine whether your emails reach customers or vanish into spam forever.

[ THE PROBLEM ]

Your Emails Are Probably Being Filtered

Email deliverability failure is the single most under-diagnosed problem in digital marketing. Up to 21% of legitimate emails never reach the inbox — and without proper authentication, your transactional emails, outreach campaigns, and onboarding sequences could be going straight to spam.

Google and Microsoft's 2024 sender policy updates made SPF, DKIM, and DMARC authentication mandatory for bulk senders. Non-compliant domains now face automated filtering — regardless of content quality. We configure these records correctly the first time, and monitor them continuously.

The Four Protocols We Configure

SPF

Sender Policy Framework

Authorizes which IP addresses are permitted to send email on behalf of your domain. A misconfigured SPF record is the most common cause of deliverability failure — we audit, flatten, and optimize your SPF to eliminate conflicts.

DKIM

DomainKeys Identified Mail

Adds a cryptographic signature to every email, verifying it hasn't been tampered with in transit. We generate and configure DKIM keys for all sending sources including ESPs, CRMs, and transactional platforms.

DMARC

Domain-based Message Authentication

Instructs receiving mail servers what to do with emails that fail SPF or DKIM checks — report, quarantine, or reject. We implement DMARC progressively, from monitoring mode to full enforcement, analyzing aggregate reports throughout.

BIMI

Brand Indicators for Message Identification

Displays your brand logo in the email inbox next to your sender name — increasing open rates and brand trust. Requires a fully configured DMARC policy at enforcement level (p=quarantine or p=reject).

TECHNICAL STACK

SPF Record Configuration
DKIM Key Signing
DMARC Policy Enforcement
BIMI Implementation
Google Postmaster Tools
MX Toolbox Monitoring
DMARC Aggregate Reports
Blacklist Monitoring

98.4%

Inbox Placement Rate (Post-Fix)

3 Days

Average Remediation Timeline

100%

DMARC Compliance on Completion

AUDIT YOUR EMAIL DELIVERABILITY

We'll diagnose every authentication gap in your email infrastructure — free, in 48 hours.

Get a Free Audit