Forward Confirmed Reverse DNS Test

Enhance Email Authentication with Forward Confirmed Reverse DNS (FCrDNS) Verification.

IP Address: 
Welcome to Campaign Cleaners Forward Confirmed Reverse DNS Test Tool

1) Please fill out the IP Address you are testing.
2) Press Test.

FCrDNS: Forward Confirmed Reverse DNS

FCrDNS, or Forward Confirmed Reverse DNS, is a key concept in email deliverability. It stands for the relationship between an IP address and its associated domain name. FCrDNS ensures that both the forward DNS lookup (from domain to IP) and the reverse DNS lookup (from IP to domain) match each other. This "full circle" validation is critical because it verifies the authenticity of the sending server, helping mail servers identify legitimate emails versus potential spam.


Why does FCrDNS matter? Email systems and ISPs use FCrDNS checks as part of their filtering and reputation-building processes. If a server’s reverse DNS does not match its forward DNS, this mismatch can raise flags, causing emails to be flagged as suspicious or rejected altogether. Maintaining correct FCrDNS settings improves the chances of successful email delivery by signaling that the sender is responsible and trustworthy.


For businesses managing their email infrastructure, ensuring that both forward and reverse DNS entries are aligned is a best practice that positively impacts email reputation, reduces bounce rates, and helps avoid the spam folder.


Once you have it set up, it's time to test it with our very own eMail Tester.

FCrDNS Lookup

Frequently Asked Questions

FCrDNS (Forward Confirmed Reverse DNS) is a method used to verify the authenticity of a domain's IP address by checking that the IP resolves back to the domain name. It is crucial for email deliverability and helps combat spam by ensuring that the sender’s IP address matches the domain name from which the email claims to originate. Proper implementation of FCrDNS can significantly enhance email trustworthiness and reduce the chances of being flagged as spam.
To implement FCrDNS, follow these steps:
  • Step 1: Ensure your domain has a valid DNS A record pointing to your server's IP address.
  • Step 2: Configure your server to include a PTR record for the IP address, mapping it back to the domain name.
  • Step 3: Use online tools to verify that the PTR record correctly resolves back to your domain.
  • Step 4: Regularly monitor and maintain your DNS records to prevent mismatches.
The benefits of implementing FCrDNS include:
  • Improved Email Deliverability: Increases the likelihood of emails reaching inboxes rather than being marked as spam.
  • Enhanced Security: Helps protect against email spoofing and phishing attacks.
  • Better Domain Reputation: Maintains a good standing for your domain, improving sender reputation.
To check your FCrDNS configuration, you can:
  • Use DNS Lookup Tools: Utilize tools like `dig` or `nslookup` to check both A and PTR records for your domain.
  • Online FCrDNS Checkers: Use online services that verify the FCrDNS configuration of your domain.
  • Monitor Deliverability: Track your email delivery rates and spam reports to ensure proper functioning.
If FCrDNS is not configured, you may face:
  • Increased likelihood of your emails being flagged as spam.
  • A negative impact on your domain reputation, leading to potential blacklisting.
  • Challenges in establishing trust with email recipients.
FCrDNS and SPF (Sender Policy Framework) work together to enhance email authentication. While SPF specifies which IP addresses are allowed to send emails on behalf of your domain, FCrDNS confirms that the sending IP is legitimately associated with the domain name. Together, they provide a stronger defense against email spoofing and improve overall email deliverability.

Are You Ready To Experience The Difference?

CC Logo

Become a part of the Campaign Cleaner community today, and join countless satisfied customers who have witnessed significant improvements in their email deliverability and campaign success. Don't let HTML issues hold you back; let Campaign Cleaner optimize your campaigns and boost your inbox rates

Let's Get Started