• volticinc@gmail.com
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  • 22 Jul 2024

Implementing SPF, DKIM, and DMARC can significantly enhance your email authentication process, ensuring your messages are trusted and reducing the risk of phishing and spam. This guide will walk you through setting up these protocols for multiple domains, ensuring a robust and secure email infrastructure.

“How to Set Up SPF, DKIM, and DMARC for Multiple Domains” for the website https://inboxautomation.co/ can be a highly valuable resource for businesses managing multiple domains. This guide can help ensure their email communications are secure and trusted by email service providers. Here’s how you could structure and detail this blog post:


Start with an overview of why SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance) are essential for securing email communications. Explain the relevance of these protocols in preventing email spoofing and phishing attacks, especially when managing multiple domains.

Understanding SPF, DKIM, and DMARC


  • Definition: Explain that SPF is an email validation system designed to prevent spam by verifying sender IP addresses.
  • Purpose: Highlight that SPF allows email servers to check that incoming mail from a domain comes from a host authorized by that domain’s administrators.


  • Definition: Clarify that DKIM lets an organization take responsibility for a message while in transit via a digital signature.
  • Purpose: Point out that DKIM provides a method to validate a domain name identity associated with a message through cryptographic authentication.


  • Definition: Introduce DMARC as a protocol for email domain alignment, helping email servers confirm that the email’s domain aligns with the SPF and DKIM records.
  • Purpose: Discuss how DMARC instructs the receiving mail servers on what to do if neither the SPF nor the DKIM headers pass alignment tests, thus enhancing email authentication.

Step-by-Step Guide to Setting Up for Multiple Domains

Setting Up SPF

  1. Create an SPF Record: Guide users through creating a TXT record in their DNS settings that lists all authorized IP addresses for sending IP.
  2. Example: Provide an example of an SPF record syntax like v=spf1 ip4: include:_spf.example.com ~all.

Setting Up DKIM

  1. Generate a DKIM Key Pair: Explain generating a public/private key pair. The public key goes in the DNS record, while the private key is kept secure on the sending server.
  2. Publish the Public Key: This section shows how to add a TXT record for DKIM in the DNS, using selector prefixes that help identify the key.

Setting Up DMARC

  1. Create DMARC Record: Instruct how to add a DMARC TXT record to the DNS settings that specify the policy for handling emails that do not authenticate.
  2. Policy Examples: Discuss examples like requests that no specific action be taken on mismatched emails but reports be sent.

Best Practices for Multiple Domains

  • Consistency Across Domains: Stress the importance of maintaining consistent SPF, DKIM, and DMARC settings across all domains to protect brand integrity and increase email deliverability.
  • Regular Updates: Encourage regular updates and audits of SPF, DKIM, and DMARC records to accommodate changes in mail servers or policies.

How Inbox Automation Can Help

Detail how Inbox Automation provides expert services in setting up SPF, DKIM, and DMARC across multiple domains:

  • Custom Configuration: Tailored setup for each domain based on its specific needs and email traffic.
  • Monitoring and Reporting: continuous monitoring of email authentication performance and regular adjustments as needed.
  • Educational Resources and Support: Providing ongoing support and educational materials ensures clients understand and can effectively manage their email authentication technologies.


Conclude by reiterating the importance of correctly implementing SPF, DKIM, and DMARC, especially when managing multiple domains. These protocols not only secure email communications but also enhance the business’s reputation and trustworthiness in the digital realm.

Call to Action

Encourage readers to contact Inbox Automation for a comprehensive assessment and professional setup of their SPF, DKIM, and DMARC records to ensure optimal email security and deliverability.

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