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How to Set Up DKIM in Office 365

How to Set Up DKIM in Office 365

DKIM, or DomainKeys Identified Mail, is an email security protocol that allows an organization to authenticate the origin and contents of a message. DKIM authentication consists of two parts: the domain key signature of the sender and the public key of the recipient. Setting up DKIM in Office 365 is the process of adding your domain keys to Office 365 so that your email is safely authenticated. It's important to set up DKIM in Office 365 because it helps protect your organization against spoofing and phishing scams. By setting up DKIM in Office 365, you can also ensure that your organization's emails are less likely to be marked as spam by email providers.

What is DKIM (DomainKeys Identified Mail)

DKIM (DomainKeys Identified Mail) is an email authentication method designed to detect email spoofing and help prevent phishing attacks. It works by adding a digital signature created using an algorithm known as DKIM to the header of an email. The signature is associated with the domain sending the email. The receiving server verifies the signature by looking up that domain's public key in an internet-wide database. If the sender's signature matches the one in the database, the server will flag the email as authentic and deliver it to the recipient's inbox. As an additional layer of security, DKIM also requires that email headers remain unchanged from the time the email is sent to the time it reaches the recipient mailbox. This means that someone attempting to send a spoofed email cannot manipulate the email headers in transit to make it appear as though the email is from an authorized sender. One advantage of using DKIM is that it can help the recipient's mail server filter out malicious emails from their inbox. The mail server can quickly compare the DKIM signature of the incoming emails and compare it to the authorized domain's public key. If the signature does not match, this is an indication that the email is likely to be malicious and the server can reject or delete it. Overall, DKIM is an important part of a comprehensive email security strategy. It offers an extra layer of protection against malicious emails and spoofing attempts aimed at compromising the recipient's mailbox. By validating DKIM signatures before delivering the email, recipients can be sure that the email is being sent from a legitimate source.

The Benefits of DKIM for Office 365

DKIM (DomainKeys Identified Mail) has become an important authentication technology for Office 365 as it provides an additional layer of protection against email malicious attacks such as phishing, spoofing and other malicious activities. DKIM is used to validate outbound emails as legitimate, as someone is claiming who they says they are. It works by digitally signing an email, and then the sender’s domain provides a ‘public key’ for anyone to verify the signature and the identity of the sender. DKIM not only helps to protect your Office 365 tenants from malicious attacks, but it can also improve the reputation of your domain. By deploying DKIM, your emails are less likely to get marked as spam. This can help business communications to reach the intended recipient by being allowed to bypass the spam filters. Using DKIM is especially helpful if you’re sending a large number of emails. DKIM can help reduce the number of emails that get blocked because of possible malicious content. It does this by keeping your emails looking more legitimate to the recipient’s firewall. This means less threat of them being automatically blocked by the recipient’s security systems without them even seeing them. In addition to providing additional security for Office 365 tenants, DKIM has other benefits. It often helps reduce the process of troubleshooting email delivery issues, as it helps to pinpoint the exact step where an email was modified or dropped, reducing the time and effort to tracking them down. Overall, incorporating DKIM into Office 365 is one of the easiest ways to strengthen your email security and improve the reputation of your domain. It can reduce malicious attacks, help to get important messages to the recipient’s inbox and make someone’s life easier when tracking email delivery issues.

What Are DKIM Public and Private Keys in Office 365?

DKIM, or DomainKeys Identified Mail, is a type of authentication process used for email. It works by having a public and private key pair associated with an Office 365 tenant and domain. The public key is used to sign outbound emails and the private key is used to decrypt messages. This ensures that the message is from a domain or mailbox that is authorized to send the message. A public key is used as an identifier. It is available in the DNS settings of a domain and can be used by any organization to verify the authenticity of a given email. By verifying the email address or domain associated with the public key, it’s possible to confirm that the email was sent from an authorized mailbox. Public keys are also used to sign outbound emails. The second component of DKIM, a private key is used to decrypt the messages received. This private key is stored in the Office 365 tenant and never leaves the organization’s system. The two keys work together in verifying an email’s authenticity, with the public key being used to digitally sign outbound messages and the private key being used to decrypt incoming emails. When a message is signed with DKIM, a unique signature is added to the message header. This signature contains information about the originating domain and its associated public key. Receiving mail server can then use the public DKIM key to verify the message’s authenticity. If the signature isn’t valid, the message could be marked as spam or even rejected altogether. DKIM public and private keys allow organizations to ensure that a message received is indeed from who claims to sent it. By setting up these keys in an Office 365 tenant, organizations can ensure that emails sent from a particular domain are not spoofed or subjected to phishing and spam attempts. This allows organizations to protect their reputation and safeguard the security of their communication channels.

DKIM Record Setup in Office 365

In order to make sure email messages sent from your Office 365 organization are not flagged as spam by other mail services, you will need to setup a DomainKeys Identified Mail (DKIM) record. A DKIM record is a digital signature added to the message header of emails. This signature is used by other email services to validate that the message has been sent from a verified sender. Without a DKIM record, your outgoing emails may be rejected or marked as spam by other mail services. To set up a DKIM record in Office 365, there are a few simple steps you'll need to follow. First, you'll need to choose a domain for your DKIM record. This should be a subdomain of the one associated with your Office 365 organization. For example, if your domain is, then your DKIM can be stored in a subdomain like Next, you'll need to create a DNS record for the DKIM subdomain. Instructions for creating a DNS record vary depending on your DNS provider, but generally the record should be a type TXT and it should contain the DKIM public key for your domain. Once you have created the DNS record, you'll need to activate it in Office 365. Once the DKIM record is activated, Office 365 will begin signing outbound emails with the DKIM signature. Every time an outbound email is sent from your organization, other mail services will be able to check the DKIM signature and verify that it has been sent from a legitimate source. By setting up a DKIM record, you can make sure that email sent from your Office 365 organization is trusted and not marked as spam. The process is quick and easy and will help protect your reputation as a legitimate sender.

DKIM is a security system and standard used to help protect email messages from spoofing and phishing. DKIM (DomainKeys Identified Mail) records are created in the Domain Name System (DNS), allowing mail servers to verify that a message has been authorized by the sending domain. Setting up a DKIM record in Office 365 can provide added protection for emails sent from your domain.

  • How to Add a DKIM Record in Office 365
  • Verifying your DKIM Record
  • Troubleshooting DKIM Issues
  • Creating a Text Record for DKIM
  • Updating Old DKIM Records

Adding the DKIM DNS Records to Office 365

Adding the DKIM DNS Records to Office 365 can help to authenticate outbound emails from your domain, and assure other email servers that your emails are legitimate. To ensure email delivery of your domain, you’ll need to add two DKIM (DomainKeys Identified Mail) records to your domain’s DNS (Domain Name System). It’s a verification protocol used by Microsoft 365 to make sure the emails you send are not spam or forged. To add the DKIM records to Office 365, you'll first need access to your DNS hosting provider. You can typically do that by creating an account with a third-party provider, as well as by managing your own DNS if you have the capability. Once you're in, you'll need to add two separate DKIM TXT records to your DNS management page. The first record should incorporate your domain into a format that looks like “._domainkey..” You'll also need to know the “selector,” which identifies that particular record and can be any combination of letters and numbers. The second record should be formatted as “selector1._domainkey. In addition to these, you'll also need to add a CNAME record that looks like “selector2._domainkey.” with “.domainkey..." Once you have all three of these records in your DNS management page, you'll need to wait for the records to propagate through the system. This can take up to 72 hours. Once the DKIM records are in place, Office 365 will be able to identify itself as the sender, meaning outbound emails are much more likely to get delivered to the intended recipient.

Verifying the DKIM DNS Records in Office 365

DomainKeys Identified Mail (DKIM) is an authentication technique arising from the email industry that helps prevent email forgery. Since it verifies that emails you receive are actually from the entity that they claim to come from, it ensures better security and protection from phishing and other forms of cyber attack. Verifying DKIM DNS records in Office 365 is an important part of the security process. The first step in verifying your DKIM DNS records is to identify them. Log into your Office 365 admin center, go to the Domains tab, select the domain (e.g. you want to set up your DKIM records for, and click on the DNS Records tab. Two TXT records for DKIM should be listed here. One will contain your domain's selector (e.g. “selector1”), while the other will contain the TXT record’s value (e.g. “v=DKIM1; . . .”). The next step is to add these records to your domain’s domain name system (DNS). The DNS provider may be different from your Office 365 provider, so go to your DNS provider to add the appropriate DKIM records. Once added, you should be able to click on the link (at the bottom of the Domains window in Office 365) to “Test these settings” to make sure that your DNS records are valid and pointing to your Office 365. Lastly, verify that the DKIM records are activated in Office 365. Go to the Admin Center in Office 365 > Settings and click on the “DKIM” tab. Here, you should be able to see if DKIM is currently Enabled or Disabled for your domain. If it has been enabled, you will be able to select a sending domain and validate its DKIM status. By verifying your DKIM DNS records in Office 365, you will be adding an extra layer of security to your company’s emails. It is an important part of the overall email security process, and it can help protect your business from cyber attack. Make sure to periodically re-verify your DKIM DNS records to ensure the best possible security for your organization's emails.

Activating the DKIM Domain Key in Office 365

DKIM (DomainKeys Identified Mail) is an important security feature in Office 365 that helps protect your organization from phishing and spoofing attacks. DKIM works by digitally signing the outgoing emails and validating the sender’s domain name with a few signature records in DNS (Domain Name System). By verifying the signature, your recipients can confirm that the email is coming from a legitimate sender. For Office 365, Microsoft requires DKIM in order to be able to utilize features like Safe Links, Spoof Intelligence, and Safe Attachments with Exchange Online Protection. So in order to take advantage of those features, you must activate the DKIM feature in your domain. The setup process of activating the DKIM domain key is not complex but it is important to follow the steps correctly. To enable DKIM, log into your Office 365 admin account and go to the admin center. Under Admin Centers, click on Exchange. On the left navigation pane, click on Protection and then click on DKIM. Click on Enable and then select your domain name from the Select a Domain selection list, and click on Enable. Once you've enabled DKIM, two DNS records will be generated, a public CNAME record and a private security text record. These two DNS records need to be added to your domain's DNS or nameservers. The public CNAME record is relatively easy to add, and you can add it to your domain DNS or nameservers. However, the private security text record can be a bit tricky to add and may require extra assistance if you are not comfortable with editing the DNS or nameservers of your domain. Once you’ve added the two DNS records, you can go back to the DKIM page in the Exchange admin center and click on the Validate button to make sure that the DKIM configuration is valid. After validating the DKIM, you will be able to use the features requiring DKIM in Exchange Online Protection. In summary, activating the DKIM domain key for Office 365 is an important step for leveraging Exchange Online Protection security features such as Safe Links, Spoof Intelligence, and Safe Attachments. Make sure to create two separate DNS records for DKIM, a public CNAME record and a private security text record, and then validate the configuration to make sure DKIM is working correctly.

Office 365 makes it easy to activate the DKIM Domain Key, which is an important security protection for digital communication. By enabling the DKIM Domain Key, you provide a layer of trust for emails sent from your domain, which helps protect against phishing and makes sure your messages don't end up in spam folders. Here are five steps to enable the DKIM Domain Key in Office 365:

  1. Go to the Office 365 admin center.
  2. Go to Domains.
  3. Click the domain you want to add the DKIM for.
  4. Open the DKIM panel.
  5. Enable the DKIM Domain Key.

DKIM Configuration Required Steps in Office 365

DKIM stands for DomainKeys Identified Mail, and it is an authentication method used to secure emails. DKIM is used to authenticate that emails are coming from a valid sender with authorized access to the domain. DKIM works by adding a digital signature to each sent email, allowing email service providers (ESPs) to verify the sender's identity. Office 365 uses DKIM to verify that the emails you send from your domain are being sent from an authorized sender. Configuring DKIM for your domain requires several steps. The first step is to create a DNS record that includes your domain and DKIM public key. This record allows the receiving domain to access the DKIM public key that was used to verify your sent messages. The second step is to activate DKIM signing in Office 365. This involves setting up a TXT record in your DNS settings for your domain. The TXT record contains the public keys that Office 365 uses to sign outbound emails for your domain. The third step is to set up domain milestones in Office 365. This ensures that messages sent from different domains can be identified and routed correctly. This includes setting up any custom MX records, Autodiscover, Sender ID, and SPF. The fourth step is to enable DKIM signature verification in Office 365. Once this has been done, Office 365 will check that all incoming messages have a valid DKIM signature. If a message does not have a valid DKIM signature, Office 365 will flag it as suspicious. Finally, you should test DKIM configuration in Office 365. You can do this by sending a test message from your account and checking to make sure that an appropriate DKIM signature is included in the messages. If the signature does not match the domain used to send the message, the message could be marked as suspicious. By following these steps, you can ensure that your Office 365 domain is properly configured for DKIM and that all email sent from your domain is securely authenticated.

How to Generate the DKIM Selectors in Office 365

DKIM (DomainKeys Identified Mail) is an important security feature in Office 365 that helps to protect your business’ emails from spoofing, meaning, it prevents someone impersonating you from sending out emails. DKIM protects the integrity of a message and its sender by verifying the identity of the sender with digital signatures. It also helps to prevent emails from being marked as spam. In order to implement DKIM onto your Office 365 emails and protect your business from spoofing and spam, you must first generate the DKIM Selector. Here’s how: 1. Log in to your Office 365 account using an admin user. 2. Click on Admin tile in the Office 365 portal and select Exchange from the list of available apps. 3. In the Exchange Admin Center, go to Protection and click on DKIM. 4. Select the domain name for which you want to generate the selector, confirm the domain, and click Enable. 5. Select the DomainKeys Identified Mail option from the menu. 6. Select the Domain radio button and enter the domain name you wish to generate the selector for. 7. Enter a selector prefix like ‘selector1’ and click Generate. At this point, your DKIM selector has been generated using the domain name you specified. You can then use this selector in your emails to help ensure that the emails are not marked as spam or spoofed. Once you have generated the selector, you should make a note of it, as you will also need this when you set up your DNS records to complete the DKIM setup. To complete your DKIM setup, use the generated selector as the value of your DKIM CNAME record in your DNS management page. Using DKIM is a great way to keep your business communications secure and free of being marked as spam. Generating the DKIM Selector in Office 365 is easy and straightforward, allowing you to complete the DKIM setup quickly and start protecting your emails right away.

Completing the DKIM Configuration in Office 365

DKIM, or DomainKeys Identified Mail, is a technology used by Office 365 to make sure emails sent from user mailboxes are encrypted and kept secure. This helps to protect against malicious actors from compromising user data and attempting to use it for their own purposes. The process of completing a DKIM configuration in Office 365 is relatively simple and straightforward. The first step is to verify the domain in which the user is sending emails from. This includes selecting a valid domain from the list available in the user's Office 365 account. Once the domain is verified, the Office 365 administrator will need to create a DNS record that will allow the DKIM configuration to be added. This DNS record generally takes the form of a TXT or CNAME record, and must be added to the user's domain name server in order for the DKIM configuration to be recognized. Once the DNS record is added, the Office 365 administrator should log into the user's Office 365 Admin account and select the “Domains” tab, followed by the “DKIM” tab. Here, the “Enable” option should be selected in order to enable DKIM authentication. After this step, the user should return to their domain name server and locate the DNS record they created earlier. Here, they should select the “CNAME” entry corresponding to the DKIM record for their domain and select “Edit”. Once the DKIM configuration has been set up, testing is recommended to ensure that it is properly configured and working as intended. This can be done using a third-party service provider that is specifically designed to test DKIM configurations. Additionally, a user should be able to check their own DKIM status by sending an email to an email address at a domain which also uses DKIM. If the message is able to be received, then the DKIM configuration was successful. Completing the DKIM configuration in Office 365 is an essential step for any user in order to ensure their emails are secure and properly authenticated when sending messages to other domains. By following the steps outlined in this article, users should be able to quickly and easily set up their DKIM configuration within Office 365.

DKIM Domains and Certificate Revocation Checks for Office 365

DKIM Domains and Certificate Revocation Checks for Office 365 is a way of ensuring that all emails sent from your domain are genuine. DKIM stands for DomainKeys Identified Mail, and it helps verify that any emails sent from your domain have not been modified by a third party. This gives your recipients confidence that any emails sent from your domain are from a legitimate source. The DKIM-signed domain is stored in an Office 365 public DNS record for verification during the transmission. It consists of two parts: a selector key and a domain key. A selector is a prefix for the record, and a domain key is a unique public key generated for your domain. This public key is used to verify that the sender is who they claim to be. In addition to DKIM, Office 365 also allows for Certificate Revocation Checks. This is an additional layer of security evoked to ensure that the legacy SSL certifications for your domain are not present in any message, as that could indicate that a bad actor has obtained the encryption keys and is attempting to spoof your domain. Certificate Revocation Checks search for unauthorized certificates by verifying that all certificates associated with your domain have been correctly verified and revoked when necessary. When sending emails from Office 365, DKIM Domains and Certificate Revocation Checks provides a much-needed layer of additional security and also helps ensure that your emails are considered legitimate and trusted by the recipient. Without this extra layer of security, your emails could end up in your recipient’s spam folder. It also helps reduce phishing attacks by ensuring that your emails are properly authenticated.

DomainKeys Identified Mail (DKIM) allows Office 365 mail senders to digitally “sign” their messages in order to prove authenticity and legitimacy. Certificate Revocation Checks are a technique used to verify the integrity of certificates that encrypt digital messages. This table outlines the differences between DKIM Domains and Certificate Revocation Checks for Office 365.

DKIM Domains Certificate Revocation Checks
Enables senders to prove message authenticity by using a digital signature Checks to find untrusted certificates and protect messages from being delivered
Allows Office 365 to sign a message with an already verified domain name Verifies that a certificate is still valid before attempting to encrypt a message
Gives internal assurance that the message originated from a trusted source Ensures that the encryption key is valid and will guarantee the secure delivery of the message

DKIM Domain-Specific Configuration Options in Office 365

Microsoft Office 365 provides DKIM (DomainKeys Identified Mail) configuration options for users who wish to authenticate their sent emails and ensure that all emails sent out from their domain are secure and properly identified. DKIM is a type of digital signature authentication that is added to emails sent from a domain, and provides a secure and reliable way to authenticate the source of the emails. When configuring DKIM in Office 365, users need to be familiar with the various domain-specific configuration options that are available. This includes the use of different various DKIM algorithms and selector types, as well as the management of different CNAME records for specific emails or domains. The DKIM algorithm works by digitally signing any emails sent out from the domain, using a public/private key pairing. The public-key is stored in the DNS records, while the private-key is stored private on the sender’s server. When an email is sent, it passes through the DKIM system and it is then verified using the public-key. The domain-specific configuration options offer a variety of different settings, from which users can choose the most secure option for their particular email set-up. These settings include the DKIM algorithms, which determine whether or not the emails sent from the domain are signed using RSA-based signatures or hash-based signatures. Selector types, which deal with the placement of the public-key in the DNS records, are also important. The two most common selector types are “default” and “domain”, which means that either a single public-key will be located in the DNS records, or multiple public-keys will be stored in the records. Finally, if users wish to use custom domains for specific emails, they can manage CNAME (Canonical Name) records, which helps to verify the sender of the email and prevent email spoofing. By understanding the various options offered for DKIM in Office 365, users can ensure that their emails are securely identified and authenticated, ensuring the highest level of protection for the emails sent from their domain.



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