What is DMARC?
DMARC means Domain-based Message Authentication, Reporting, and Conformance. This is a marketing tool that you can use to protect your company’s email domain. Any organization can use it for the same purpose. It also ensures that people can verify whether an email message is from your company.
DMARC also makes it possible for an organization to create a policy that shows how it wants to verify email that claims to come from its domain. The policy will also tell receiving mail servers on how to check emails and handle messages that fail the test.
The need to verify email messages is very important. It helps prevent people from using a domain without the owner’s permission. This may include phishing scams, email spoofing, and other related cybercrimes. It also ensures that both the receivers and email senders are not deceived by such messages.
DMARC shows domain owners how to:
- Publish how they verify email messages.
- What to do with emails that fail the authentication check.
- How to report actions it takes on emails that disguises to come from its domain.
When a company or an organization adopts DMARC, it will:
- Provide the company with reliable authentication report.
- Reduce the rate of successful phishing.
- Allow receivers to determine whether an email is from your domain or not.
How Does DMARC Work?
DMARC works on a simple but effective principle. It uses both the DKIM (Domain Keys Identified Mail) and SPF (Sender Policy Framework) to show whether a message is genuine or not. It also uses the Domain Name System (DNS) for the same purpose.
This is how DMARC carries out validation of each email:
1. A domain administrator issues a list of instructions that contains information on how to know a real or fake message. It also explains what receiving mail servers should do if a mail fails the check. The domain’s DNS records contain the DMARC policy and other necessary information.
2. When an incoming email reaches the mail server, the server will use the DNS to go through the DMARC policy. This will allow it to check the identity of the domain name in the “From” header.
The server will go through the message to check three important factors:
- Does the DKIM signature of the message pass the validation check?
- Is the message from IP addresses that the domain of the sending SPF records allows to send messages?
- Do the message’s headers show the right domain alignment
3. With the information it gets from the check, the server will use the DMARC policy of the domain sending the message to decide what to do. It may reject the message, accept it, or flag it.
4. After making the right decision, the receiving server will send the result of its findings to the owner of the sending domain.
When a company adds a DMARC record to its DNS record, the DMARC will allow the company to know those who use its domain to send email messages. Thus, the company can use the information to know the actual place the message originated from, not where it claims to come from.
If you are a domain owner, such information can help you know the type of messages that come out from your domain. You will also know those using your domain to send messages without your permission. This will prevent people from sending unwanted messages to your customers. Your customers will only receive emails from your company and not from dubious people trying to cheat them.
It also allows your customers to know that emails from your company are not from people they don’t know. This will protect your company from spoofing and phishing attacks that can ruin your reputation or destroy your company. That is the level of security DMARC offers your brand.
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Published by GingerHippo