How to Solve Email Issues After Adding a Site on Cloudflare

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After adding a site to Cloudflare, you may encounter email issues due to changes in DNS settings that affect how email services are configured and routed. Common problems include emails being delayed, not delivered, or marked as spam. To resolve these issues, start by ensuring that your DNS records on Cloudflare include correct MX (Mail Exchange) records pointing to your email provider’s servers. Verify SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) records are correctly set up to authenticate your email domain and prevent emails from being flagged as spam. Additionally, adjust firewall settings in Cloudflare to allow SMTP (Simple Mail Transfer Protocol) traffic for outbound emails. Monitor email delivery and performance closely after making changes to ensure everything functions smoothly.

Understanding DNS Changes

When you add a site to Cloudflare, your domain’s DNS (Domain Name System) settings are typically migrated to Cloudflare’s DNS management system. This includes records such as A (Address), CNAME (Canonical Name), and MX records. Email issues often arise because Cloudflare’s default DNS settings may not align with your email provider’s requirements. It’s crucial to review and update DNS records to ensure they accurately reflect your email setup, particularly MX records that specify the mail servers responsible for receiving email on behalf of your domain.

Verifying MX Records

MX (Mail Exchange) records direct incoming emails to the correct mail servers. After adding your site to Cloudflare, verify that MX records point to the correct email provider’s servers. This information is crucial for email delivery. Incorrect MX records or misconfigured settings can cause emails to bounce back to senders or be routed incorrectly. Update MX records in Cloudflare’s DNS settings dashboard according to your email provider’s instructions to ensure seamless email communication.

Setting up SPF and DKIM Records

SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) records are essential for email authentication and security. SPF records specify which mail servers are authorized to send emails on behalf of your domain, helping to prevent email spoofing and phishing attacks. DKIM records use cryptographic signatures to verify the authenticity of email messages sent from your domain. After adding your site to Cloudflare, ensure SPF and DKIM records are correctly configured to align with your email provider’s guidelines. This enhances email deliverability and reduces the likelihood of your emails being marked as spam.

Adjusting Firewall Settings

Cloudflare’s firewall settings may restrict SMTP (Simple Mail Transfer Protocol) traffic necessary for sending outbound emails. To prevent email delivery issues, adjust firewall rules in Cloudflare to allow SMTP traffic for your email server’s IP addresses. This ensures that outgoing emails can be sent without interference from security measures that might block SMTP traffic by default. Consult Cloudflare’s documentation or support resources for guidance on configuring firewall rules specific to email services.

Monitoring Email Delivery

After making DNS and firewall adjustments on Cloudflare, monitor email delivery and performance closely. Use tools provided by your email service provider to track email delivery rates, identify any bounce-back messages or delivery delays, and check email headers for authentication results. This proactive monitoring allows you to detect and address any issues promptly, ensuring that emails are delivered reliably and efficiently.

Testing Email Configuration

Testing your email configuration after adding a site to Cloudflare is crucial to verify that changes have been implemented correctly. Send test emails to different accounts and monitor their delivery status. Check for any error messages, delays, or unusual behaviors that may indicate ongoing issues with email delivery. Testing allows you to fine-tune DNS settings, adjust firewall rules, and troubleshoot potential problems before they impact regular email communications.

Troubleshooting Common Issues

If you continue to experience email issues after configuring DNS settings and adjusting firewall rules on Cloudflare, consider common troubleshooting steps. Check for typos or inconsistencies in DNS records, ensure that MX, SPF, and DKIM records are up to date, and verify that email server configurations match Cloudflare’s settings. Review Cloudflare’s support documentation and forums for known issues or solutions related to email setup and integration. Consulting with your email service provider’s support team can also provide insights and assistance in resolving persistent email delivery problems.

Utilizing Email Delivery Services

For enhanced email delivery management, consider utilizing email delivery services or SMTP relay providers that integrate seamlessly with Cloudflare. These services offer robust email infrastructure, real-time analytics, and dedicated support to ensure reliable email delivery. By leveraging specialized email delivery solutions, you can optimize email performance, mitigate delivery issues, and maintain high deliverability rates for your communications.

Seeking Expert Assistance

If email issues persist despite troubleshooting efforts, consider seeking expert assistance from IT professionals, email administrators, or consultants specializing in DNS management and email delivery. They can conduct a thorough audit of your DNS settings, diagnose underlying issues affecting email delivery, and recommend tailored solutions to optimize your email setup on Cloudflare. Expert guidance ensures that your email infrastructure is configured correctly, compliant with industry standards, and capable of supporting seamless communication for your organization.


Resolving email issues after adding a site to Cloudflare requires a systematic approach to DNS management, firewall configuration, and email authentication. By verifying and updating MX, SPF, and DKIM records, adjusting firewall settings to allow SMTP traffic, and monitoring email delivery performance, you can effectively address common challenges associated with email integration on Cloudflare. Testing email configurations, troubleshooting issues promptly, and leveraging specialized email delivery services further enhance reliability and efficiency. By prioritizing proper email setup and maintenance, organizations can ensure uninterrupted communication and maximize the benefits of using Cloudflare’s robust web performance and security solutions.