What is DMARC? A Complete Guide to DMARC Email Protection

[nusaibatara]

1. Introduction
With the development of the Internet, email has become an indispensable communication tool in people's daily life and work. However, email also faces various security threats, such as spam, phishing, email fraud, etc. In order to ensure the security of email, many enterprises and organizations have adopted various security measures, one of which is DMARC. DMARC is an email security protocol based on Domain-based Message Authentication, Reporting & Conformance, which can help enterprises and organizations prevent email fraud and spam, and improve the security and credibility of email.
2. Basic principles of DMARC
The basic principle of DMARC is to instruct the receiver how phone number list to handle emails that do not comply with the DMARC policy by adding specific tags in the DNS record. DMARC policies can be formulated by the organization itself, including the following aspects: 1. **P=quarantine**: Indicates that emails that do not comply with the DMARC policy will be marked as spam and quarantined or deleted. 2. **P=reject**: Indicates that emails that do not comply with the DMARC policy will be directly rejected and not delivered. 3. **P=None**: Indicates that no action will be taken, allowing the receiver to handle emails that do not comply with the DMARC policy on its own.
When the recipient receives the email, it will check the email according to the DMARC policy. If the email does not comply with the policy, the recipient will handle it accordingly.

3. The role of DMARC
The main functions of DMARC include the following aspects: 1. **Prevent email fraud**: DMARC can prevent attackers from using forged domain names to send emails, thereby reducing the risk of email fraud. 2. **Improve email reputation**: By implementing DMARC policies, organizations can show email recipients that they value email security and improve the reputation and credibility of emails. 3. **Reduce spam**: DMARC can help organizations identify and block spam that does not comply with their policies, thereby reducing the amount of spam. 4. **Enhance email visibility**: DMARC can provide detailed information about email delivery and processing, helping organizations better understand their email flows, thereby enhancing email visibility and controllability.
IV. DMARC Implementation
To implement DMARC, organizations need to complete the following steps: 1. **Develop a DMARC policy**: Organizations need to develop a suitable DMARC policy based on their own needs and security requirements. 2. **Add DMARC records in DNS**: Organizations need to add specific DMARC records in DNS records to instruct recipients how to handle emails that do not comply with the DMARC policy. 3. **Notify email recipients**: Organizations need to notify all email recipients of their DMARC policy, including email servers, email clients, etc. 4. **Monitor and evaluate**: Organizations need to regularly monitor and evaluate the implementation of DMARC, and adjust policies and measures in a timely manner to ensure the effectiveness of DMARC.
5. DMARC Challenges and Solutions
Although DMARC has many advantages, it also faces some challenges in its implementation, such as: 1. **Lack of DNSSEC support**: DNSSEC is the basis of DMARC. If DNSSEC is not supported, the implementation of DMARC will be limited. 2. **Compatibility of email receivers**: Different email receivers may have different levels of support for DMARC, which may cause emails to fail to be delivered normally or be misjudged. 3. **Complexity of strategy**: The formulation of DMARC strategy needs to take into account many factors, such as the source of the email, the content of the email, etc. If the strategy is not formulated properly, it may cause emails to be misjudged or fail to be delivered normally.
To address these challenges, organizations can take the following actions:

Ensure DNSSEC support : Organizations need to ensure their DNS servers support DNSSEC to ensure effective DMARC implementation.
Optimize the compatibility of email receivers : Organizations can communicate and negotiate with email receivers to ensure their support and compatibility with DMARC.