DMARC Compliance Made Simple
Your one-stop solution for all things DMARC. Solve email security, spoofing and deliverability issues.
What is DMARC Compliance?
DMARC compliance means that an organization’s email domain is configured to align its SPF and/or DKIM authentication checks with its DMARC policy. This ensures that only legitimate emails are successfully delivered while unauthorized messages are rejected or quarantined.
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Microsoft DMARC requirements: A comprehensive guide
From May 5, 2025, Microsoft mandates that all organizations sending 5 000 or more emails per day to its consumer services must implement DMARC, SPF, and DKIM to authenticate messages.
Senders must publish a DMARC record with at least a p=none policy and ensure alignment between DMARC and either SPF or DKIM. Non-compliance can result in messages being rejected or filtered into Spam folders.
Check out our guide on the Microsoft DMARC requirements to learn more.
Microsoft DMARC requirements explained
To comply with the Microsoft DMARC requirements, senders must implement:
DMARC
A DMARC record, with a minimum policy of p=none, must be published for the domain. This tells email receivers how to handle messages that fail SPF or DKIM checks. DMARC must be aligned with either SPF or DKIM, preferably both.
SPF
All outbound emails must pass SPF checks. SPF verifies that an email server is authorized to send messages on behalf of the domain.
DKIM
All outbound messages must pass DKIM checks. DKIM applies a digital signature to verify the message's integrity and authenticity.
Who must comply with the Microsoft DMARC requirements?
Any business sending 5 000 or more messages daily to Microsoft email accounts must meet these requirements.
This includes:
Internal and hosted email systems
CRM, ERP, and e-commerce services
Email marketing platforms
Transactional emails
Third-party senders
Failure to comply may result in:
Increased risk of spoofing and phishing
Messages being rejected by Microsoft
In partnership with Sendmarc, we Implement DMARC and solve your email delivery, impersonation & spoofing problems
A historical email flaw means that cybercriminals can impersonate almost any domain and deliver fake emails to inboxes on your behalf. This causes business damage and impacts the deliverability of the emails you send. Sendmarc mitigates this flaw by ensuring your brand’s domain is secured with DMARC protection.
By ensuring your domain is DMARC compliant, Sendmarc helps your business achieve the following email benefits:
Trust
Stop fake emails being sent from your domain and ensure that all recipients can trust the emails they receive from you.
Visibility
Our DMARC reports collect data from servers worldwide, turning it into actionable insights, and give you visibility of who is sending emails from your domain.
Delivery
Strong DMARC compliance and policies ensure that all legitimate emails with your name reach the intended inbox, not Spam or Junk folders.
Compliance
Sendmarc ensures compliance with global regulatory standards, providing compliance to every email service used by every department.
How DMARC compliance ensures domain protection
Check out how Sendmarc simplifies the implementation and management of DMARC
Sign up for a free 14 Day Trial.
Getting started is easy – simply update your DNS by adding a CNAME record.
End-to-End DMARC Implementation
In partnership with Sendmarc we manage the entire DMARC implementation process, ensuring seamless integration with your existing email infrastructure.
Full DMARC Setup & Configuration – SPF, DKIM, and DMARC records optimised for maximum security.
Continuous Monitoring & Reporting – Real-time visibility into email authentication and threats.
Policy Enforcement – Gradual enforcement of strict policies to prevent email fraud without disrupting legitimate emails.
Proactive Security Management – Ongoing adjustments and support to maintain email security.
Why Choose Our Managed DMARC Service?
In partnership with Sendmarc we manage the end-to-end implementation of DMARC within your organisation, and we aim to implement policies that will significantly prevent e-mail impersonation from your domains within 90 days.
Expert Guidance – We take the complexity out of DMARC, ensuring correct implementation and compliance.
Proactive Threat Prevention – Our service actively prevents domain abuse, protecting your brand and stakeholders.
Seamless Deployment – No additional infrastructure required; fully managed by our security specialists.
Improved Email Deliverability – Ensures your business-critical emails reach their intended recipients.
DMARC FAQs
What is a DMARC record?
A DMARC record is a DNS TXT entry that tells receiving servers how to handle unauthenticated messages and where to send reports.
Do I need DMARC if I already have SPF or DKIM?
Yes. DMARC aligns SPF and DKIM with the domain in the ‘From’ header and adds policy enforcement and reporting capabilities.
Can I publish more than one DMARC record?
No, only one DMARC record is allowed per domain. Subdomains can have their own DMARC records, which might be different from the policy set on the root domain.
What does it mean if DMARC fails?
A DMARC fail means the message failed both SPF and DKIM alignment checks and didn’t comply with the domain’s DMARC policy.
How can I validate my DMARC record?
Use Sendmarc’s DMARC checker to test and validate your company’s setup.
What if my DMARC policy is incorrect?
Incorrect DMARC policies can block valid messages or may fail to prevent spoofing. Start with a p=none policy, then progress to p=quarantine or p=reject.
Does DMARC prevent all phishing?
DMARC significantly reduces domain spoofing but should be part of a wider security strategy that includes user training.
Interested in adopting DMARC at your organization?
Check out how Sendmarc simplifies the implementation and management of DMARC.
Sign up for a free 14 Day Trial.
Getting started is easy – simply update your DNS by adding a CNAME record.