Email Authentication | Online Help - Zoho CRM

Email Authentication

Zoho CRM provides email authentication standards that allows the organizations to increase the trustworthiness of an email's origin when they choose to send emails from Zoho CRM using their domain. To authenticate your emails sent from Zoho CRM, you need to validate the following authentication standards:

  • Domain Verification
  • DKIM (Domain Keys Identified Mail)
  • SPF (Sender Policy Framework)
Permission Required
Users with the Administrative profile can access email authentication.

Email Authentication

Authenticating the email source consists of the following steps:

Step 1. Add your company's domain or subdomain

Adding your company's domains or subdomains is the first step for email authentication. Domain verification helps to ensure that the domain from which the emails are sent is authentic and trustworthy. To facilitate this, you have to add your company's email address and the domains or subdomains in Zoho CRM.

Step 2. Verify the domain details

Once you add the domain, a verification code is generated and sent to the email address that should be entered to verify the domain details. The verification email is valid for 15 days, in case you do not receive an email or you have exhausted the validity period, you can use the Resend Mail link.

Step 3. Validate the records

Once the domain and subdomains details are verified, you can select either of the two email authentication standards to validate the email source:

DKIM - DKIM is used to ensure that the message has not been altered in transmission. It uses public key encryption to authenticate the email messages.See Also DKIM Configuration

SPF - This authentication standard allows sending domains to define which IP addresses are allowed to deliver email messages on behalf of the domain. See Also SPF Configuration

  1. Mass emails and emails sent from the organization email address are always sent from Zoho's server.
  2. Another authentication standard that the sending domains use to block fraudulent emails is DMARC (Domain-Based Message Authentication, Reporting, and Conformance). It is built as a combination of the DKIM and SPF standards with additional features like reporting, policy definition, and the notion of identity alignment. A domain needs to pass both SPF and DKIM to satisfy the DMARC regulation. 

Add Your Company's Domain

To add your company's domain

  1. Go to Setup > Channels > Email > Email Deliverability > Email Authentication.
  2. In the Email Authentication tab, click Add Domain.

  3. In the Add Domain page, enter the Email Address.
  4. Click Add Domain.

Verify the Domain Details

To verify the domain and subdomain details

  1. Go to the Domain and click Enter Code.
  2. In the Verify Domain popup, enter the Verification code.
  3. Click Verify.

Validate the Records

To validate the records

  1. Go to the Domain and click Validate Records.
  2. In the Authenticate Domain popup, copy the SPF or DKIM record code.
  3. Paste the code in your DNS settings.
  4. Click Validate Record, once the code is added.


    Zoho DataPrep Personalized Demo

    If you'd like a personalized walk-through of our data preparation tool, please request a demo and we'll be happy to show you how to get the best out of Zoho DataPrep.

    Zoho CRM Training

      Create, share, and deliver

      beautiful slides from anywhere.

      Get Started Now

              Zoho CRM Training Programs

              Learn how to use the best tools for sales force automation and better customer engagement from Zoho's implementation specialists.

              Zoho CRM Training

                Zoho SalesIQ Resources

                    Zoho TeamInbox Resources

                              Zoho DataPrep Resources

                                Zoho DataPrep Demo

                                Get a personalized demo or POC

                                REGISTER NOW

                                  Design. Discuss. Deliver.

                                  Create visually engaging stories with Zoho Show.

                                  Get Started Now

                                                        • Related Articles

                                                        • Troubleshooting Email Authentication

                                                          1. I am getting an error which says "DKIM record missing". After entering the public key value in you domain settings page, go to and select TXT. Enter the public key value you generated in CRM and select Lookup. ...
                                                        • Troubleshooting Email Relay

                                                          1. Why am I getting an authentication failure error? Make sure that the password you entered is correct. To verify the password, log in to your webmail with the same password by typing in the password instead of using auto-fill. Check whether TFA is ...
                                                        • Email Parser

                                                          An Email Parser is designed to automate the process of adding records to Zoho CRM by extracting information from incoming emails. The leads' details can be extracted by the email parser and added directly to your CRM records. For example, imagine you ...
                                                        • Setting up Email Relay

                                                          Email Relay allows you use your company server to send emails from Zoho CRM. Once the relay server is setup, the emails are sent in this manner: Zoho CRM -to- Relay server -to- Recipient.  Sending emails through a relay server lets you combat ...
                                                        • Email Limits

                                                          In Zoho CRM, you can either send bulk emails or individual emails. Following are the limits for sending emails based on your account's Edition. Please note that email limits will be set based on the organization's time zone. Mass emails and emails ...



                                                        Watch comprehensive videos on features and other important topics that will help you master Zoho CRM.


                                                        Download free eBooks and access a range of topics to get deeper insight on successfully using Zoho CRM.


                                                        Sign up for our webinars and learn the Zoho CRM basics, from customization to sales force automation and more.

                                                        CRM Tips

                                                        Make the most of Zoho CRM with these useful tips.

                                                          Zoho Show Resources