Implementing DMARC monitoring, SPF, and DKIM is no longer optional for MSPs—it’s a critical business differentiator Managed Service Providers face recurring challenges with DNS access, shadow senders, and DKIM misconfigurations. This guide breaks down the most common DMARC pain points and shows how to solve them using automation and best practices practices.

Table of Contents

1. DNS Ownership and Delegation Barriers

2. Shadow Senders and Unknown Email Sources

3. SaaS Email Platforms with Broken or Missing DKIM

4. DNS Delegation Fears and Myths

5. No Standardized DMARC Onboarding

1. DNS Ownership and Delegation Barriers

MSPs face tough challenges getting access to client DNS settings, especially when websites or IT vendors retain control. This pain starts when critical records (SPF, DKIM, DMARC) need updating, but you don’t have access.

Common scenario: A client’s web developer controls their DNS and is unfamiliar with email authentication records, causing delays and increased risk.

What Works:

• Urge clients to retain ownership of their DNS.

• Recommend DNS delegation so MSPs can add only the specific records necessary.

• Explain: “We need minimal access just to protect your business email not to touch your website.”

2. Shadow Senders and Unknown Email Sources

DMARC reports often show unauthorised third-party or legacy systems impersonating your domain. These “shadow senders” sneak through the cracks, risking your deliverability and reputation.

What Works:

• Set up routine DMARC monitoring to catch new senders early.

• Use automated notifications for sender inventory, flagging unknown or risky services.

• Have a standard approval and remediation process in place for any newly discovered senders.

3. SaaS Email Headaches: Broken or Missing DKIM

Many cloud services still don’t fully support custom DKIM domain signing. For MSPs, this means more support tickets and frustrated clients when emails don’t land.

What Works:

• Validate DKIM support before deploying any new SaaS or email platform.

• Keep a client-by-client list of approved senders with DKIM status noted.

• Demand DKIM instructions from vendors; use a template email for onboarding.

4. DNS Delegation Fears & Myths

Beyond practical control issues, MSPs routinely face myths and fears about DNS access. Some agencies warn clients never to grant partial access, so the agencies hold full control of the DNS.

What Works:

• Gently educate: Delegating access specifically for email authentication records (SPF, DKIM, DMARC) typically does not impact your website’s operation or content.

• Provide clear documentation on safe delegation practices, using trusted references.

• Reassuring clients with proof and process.

5. No Standardised DMARC Onboarding

Without a repeatable onboarding process, MSPs risk missing essential authentication records and delaying ongoing monitoring. Every new client should trigger a streamlined process.

What Works:

• Use an onboarding checklist for each new domain (see asset below).

• Schedule quarterly email security reviews, including DMARC report audits and valid senders.

• Share reporting data with stakeholders for transparency.

DMARC Onboarding Checklist (For MSPs and IT Teams)

• Confirm DNS owner and access.

• Set up targeted DNS delegation (SPF, DKIM, DMARC).

• Inventory of all sending systems and apps (marketing, SaaS, etc.).

• Ensure DKIM is enabled on every legitimate sender.

• Monitor DMARC aggregate reports routinely.

• Review audit findings and resolve shadow sender issues.

Take Action: Simplify DMARC Pain With Automation

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