Email Deliverability Fix | Human Layer Labs
Email Authentication Service

Email Deliverability Fix for Your Domain

A specialist service to audit and repair SPF, DKIM, and DMARC so legitimate business emails stop landing in spam or bouncing at Google and Yahoo.

Designed for consultants, agencies, B2B founders, and internal teams sending sales outreach, proposals, and onboarding emails from their own domain.

On this page

Overview Core protocols Technical scope Process FAQ How to book

What this service does

Problem

Your legitimate business emails are being filtered, bounced, or flagged as suspicious because your domain is not correctly authenticated.

Service

A one-off, guided technical engagement where your SPF, DKIM, and DMARC are audited, corrected, and verified across the tools that send mail for your brand.

Outcomes

Better inbox placement for sales and account emails, fewer authentication errors, and a clear record of how your domain is configured going forward.

The 3 Essential Protocols

These are the technical signatures email providers use to trust messages from your domain.

SPF: The Guest List

Identifies which servers are authorized to send mail for your domain. Consolidating this correctly reduces “unauthorized sender” errors and spam placement.

Common DIY issue

Multiple SPF records or too many DNS lookups can cause a “PermError,” making even legitimate emails fail authentication.

DKIM: The Wax Seal

A cryptographic digital signature that proves the content of your email has not been changed in transit, boosting trust and reducing tampering risk.

Common DIY issue

Weak or misconfigured keys can lead to “Unauthenticated” messages, even when you own the domain and sender account.

DMARC: The Law

Tells receiving servers what to do when SPF or DKIM checks fail, protecting your brand from spoofing and helping large providers enforce their 2025 rules.

Common DIY issue

Jumping straight to “reject” without staged monitoring can accidentally block your own invoices, notifications, or CRM emails.

Technical scope & limits

Domain-wide authorization

Your DNS is audited to identify all current senders (CRM, marketing platform, invoicing, booking tools). These are consolidated into a single, compliant SPF configuration to avoid lookup limits and split records.

Cryptographic signing

DKIM keys (typically 2048-bit, where supported) are generated and published for your primary senders so outbound messages carry a verifiable cryptographic signature.

Policy enforcement & monitoring

DMARC is configured in a staged way, usually starting with “none” and moving toward stricter policies once delivery is validated. You receive guidance on interpreting reports and next steps.

What is not included

This service focuses on authentication and DNS-level configuration. Deep sender-reputation repair, list hygiene projects, or marketing strategy work are out of scope and may require separate engagements.

How the engagement works

Step 1

Intake & discovery

A brief questionnaire captures your domains, email providers, and tools that send mail on your behalf, plus any current error messages or spam issues.

Step 2

Configuration & repair

SPF, DKIM, and DMARC records are updated through your DNS/tenant, following best practices for modern providers such as Microsoft 365 and Google Workspace.

Step 3

Testing & documentation

Test sends and header analysis confirm the changes. You receive a concise report you can reference later or share with internal IT and vendors.

Frequently asked questions

Who typically uses this service?

Most requests come from small B2B teams, consultants, and agencies whose sales emails, proposals, or onboarding messages are being filtered or flagged by major providers.

Will this fix a blacklisted domain?

Authentication fixes are necessary, but they may not fully resolve issues caused by a severely damaged sender reputation or past list abuse. If blacklist or reputation problems appear, they are highlighted in your report.

Do you need access to my inbox?

No. Work is done at the DNS and admin-console level, using least-privilege access and, where preferred, guided sessions rather than direct password sharing.

How does this relate to other security services?

Email authentication is one layer of your broader security posture. It complements phishing defenses, human-layer training, and incident response, which can be scoped separately if needed.

How to book this service

To purchase the Email Deliverability Fix as a one-time project, use the dedicated booking page or reach out if you prefer to include it inside a broader security engagement.

Open booking & pricing page Email Spam Fix
Contact Human Layer Labs Email intake@humanlayerlabssecurity.com