Email Domain Verification | Zoho Assist - User Guide

Email Domain Verification

Why verify your email domain?  

Administrators can send emails from Zoho Assist using their company's email address. This can help companies improve the authenticity and credibility of their message. However, when a third-party service like Zoho Assist sends out an email on your behalf, there's a chance that these emails may be considered spoofing, phishing attempts and marked as spam by the recipient’s email services based on their DMARC (Domain-based Message Authentication Reporting and Conformance) policy. To handle situations like this, we have introduced email domain verification in Zoho Assist using Domain Keys Identified Mail (DKIM) method. 


What is DKIM?  

DKIM is an email authentication method that helps companies take responsibility of their message in transit, and mailbox providers to check the source of each message using cryptographic techniques. For each email, DKIM will attach a signature during the transmission to verify the authenticity of the message source. This way, companies can prevent spammers from sending out emails impersonating them, and enable third-party services to send emails on their behalf without them being marked as spam.

How DKIM works in Zoho Assist?  

  • A public key will be published as a TXT record for your domain's DNS Manager, and every outgoing email from Zoho Assist will have a signature attached to its header, generated using the private key of your domain. 

  • Your recipient's email server will check the email header of each message with the public key stored in your DNS record every time. 

  • This will help email services to verify your domain ownership. 

  • Emails will land in the spam folder of your recipient's mailbox if this verification failed.

For example, if is sending a document to using Zoho Assist, the email from Malcolm will have a signature added to its header (generated using the private key of the domain-zylker) and the public key of the domain - zylker will be already published as a TXT record in the zylker's DNS Manager. Frida's email server will validate the email's legitimacy with Malcolm's email header and the public key stored in Malcolm's DNS record. If the verification is successful, the email sent by Malcolm will land into Frida's inbox instead of being classified as SPAM. 

To verify your email domain ownership using DKIM in Zoho Assist, you need to complete the three steps as mentioned below:

  • Add domain name

  • Add TXT record

  • Verify domain ownership 

Add domain name

This step is necessary for Zoho Assist to recognize your domain, and generate a key (hostname, value) for that domain. 

    1. Navigate to Settings > General > Email Configuration.

    2. Click Domain verification.

    3. Click Add & Verify New Domain.


    4. Enter your domain name. For example, if your email ID is, the domain name to be entered is

    5. Click the Generate Key button. This will generate a hostname and value. 


Add TXT record

In this step, you need to publish your domain's public key as a TXT record in your DNS Manager. Every outgoing email from Zoho Assist will have a signature added to its header generated using the private key of your domain. Your recipient's email server will validate emails sent from Zoho Assist using the public key published in your DNS record. 


    1. Login to your DNS Manager.

    2. Select the TXT Method tab in the Domain Verification page.

    3. Create a TXT record in your DNS with the title as the hostname. For example, should be the name of the TXT record if that was the hostname provided.

    4. In the TXT record value, paste the content you copied from the Value field in Zoho Assist.

    5. Save the TXT record in the DNS Manager.

    6. Go to Zoho Assist and click Verify Now

Verify domain ownership


    1. Ensure you have completed adding the TXT record in the DNS Manager.

    2. Click the Verify Now button.

    3. If the entry has been added correctly, your domain would be marked as verified and emails sent from Zoho Assist will be signed and verified using the key pairs.

    4. You should not remove this TXT record from your domain hosting console as long as you continue to use that email address in Zoho Assist. If not your email domain will be marked as not verified again and your emails may land in spam.  

Important note: 

It will usually take few hours for your domain to get verified based on the TTL (Time To Live) value in the TXT record.

For more information on DKIM configuration, please write to us at  

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