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Message Board > Complete Guide to Office 365 DKIM Setup
Complete Guide to Office 365 DKIM Setup
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Mar 16, 2026
12:24 PM 		Email security has become a office 365 dkim setup critical concern for businesses of all sizes. With phishing attacks, email spoofing, and other cyber threats on the rise, ensuring that your emails are authentic is essential. One of the most effective ways to protect your organization’s email domain is by configuring **DKIM (DomainKeys Identified Mail)** for [Office 365 dkim setup](https://dmarclytics.io/). In this guide, we’ll explore what DKIM is, why it matters, and how to set it up in Office 365 with step-by-step instructions.

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## What is DKIM?

**DKIM (DomainKeys Identified Mail)** is an email authentication method that allows an organization to take responsibility for a message in transit. It does this by attaching a digital signature to the email header. This signature can be verified by receiving servers to ensure that the email was indeed sent from the authorized domain and has not been altered in transit.

DKIM works alongside other email authentication technologies like **SPF (Sender Policy Framework)** and **DMARC (Domain-based Message Authentication, Reporting & Conformance)** to provide a comprehensive email security strategy. While SPF verifies the sender's IP address, DKIM ensures the integrity of the message content itself.

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## Why DKIM is Important for Office 365

Microsoft 365 (formerly Office 365) is a widely used platform for business communication. Without DKIM, emails sent from your domain may be vulnerable to spoofing, making it easier for attackers to impersonate your brand. This can lead to:

1. **Increased phishing attacks** – Fraudsters can send emails appearing to come from your domain.
2. **Deliverability issues** – Emails may land in the recipient’s spam folder or get blocked.
3. **Reputation damage** – Recipients losing trust in your organization due to fraudulent emails.

By enabling DKIM in Office 365, you ensure that your emails are signed with cryptographic signatures, increasing trust and email deliverability.

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## Prerequisites for Office 365 DKIM Setup

Before you begin, you need:

1. **Administrator access** to the Office 365 tenant.
2. **A domain registered** and verified in Office 365.
3. **Access to your DNS provider** to add CNAME records.

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## Steps to Set Up DKIM in Office 365

### Step 1: Access the Microsoft 365 Defender Portal

1. Sign in to the **Microsoft 365 admin center** with your admin credentials.
2. Navigate to **Settings ? Domains** to ensure your domain is verified.

### Step 2: Navigate to DKIM Settings

1. Go to **Microsoft 365 Defender portal**.
2. Navigate to **Email & Collaboration ? Policies & Rules ? Threat Policies**.
3. Click on **DKIM** under the **Email authentication** section.

### Step 3: Select Your Domain

1. You will see a list of your verified domains.
2. Select the domain for which you want to enable DKIM.

### Step 4: Add CNAME Records in Your DNS

Office 365 requires two CNAME records for DKIM. These records point your domain to the Office 365 DKIM signing service.


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