Summary
If your website is hosted on a Fastly IP range listed on Spamhaus, but you don't send email from that IP, the primary concern shifts from email deliverability to website accessibility and reputation. Experts and documentation suggest the root cause might not be your direct activity but the shared IP nature of CDNs like Fastly, where other users' actions can affect the entire IP range. While direct email deliverability might be unaffected, website accessibility for some users could be impacted. A crucial step is to ensure your own website's security and content are not triggering blacklists. Monitor website traffic and loading speeds. If the listing significantly impacts website performance or accessibility, consider contacting your hosting provider, exploring alternative CDNs, or migrating to a different IP address. Verifying the validity and security of your DNS records, including preventing open resolvers, is also essential. Remember to investigate to see if the spamhaus listing is causing issues, or if there are other possible issues causing hard bounces or other issues.
Key findings
- Indirect Email Impact: While direct email deliverability might be unaffected, the Spamhaus listing can still affect other parts of your business
- Impact on Website Access: If you aren't sending email, a Spamhaus listing might affect website access for some users.
- Shared IP Reputation: CDNs use shared IP ranges, so the actions of other users can affect your IP's reputation.
- Proactive Security: Ensuring you protect your website, and use a WAF can stop your site from getting onto blacklists.
- It May Not Be Spamhaus: Be sure to investigate and ensure that the spamhaus listing is in fact causing your issues, or if there are other causes.
Key considerations
- Monitor Website Performance: Continuously monitor website traffic, loading speeds, and accessibility to identify any negative impacts from the listing.
- Investigate Spamhaus Listing: Contact Spamhaus to understand the specific reasons for the listing and any steps you can take to help resolve the issue (though direct action might be limited).
- Contact Hosting Provider: Contact your hosting provider to investigate the issue and potentially migrate your website to a different IP address.
- Evaluate Alternative CDNs: If the listing significantly impacts website performance, explore alternative CDN providers.
- Secure Your Website: Implement robust security measures to protect your website from malware and hacking attempts.
- Contact Correct Party: Contact the provider of the shared IP if they are responsible for it.
- Check DNS settings: Validate that you DNS settings, including preventing open resolvers
What email marketers say
8 marketer opinions
If your website is hosted on a Fastly IP range listed on Spamhaus, but you don't send email from that IP, the primary concern shifts from email deliverability to website accessibility and reputation. The shared IP nature of CDNs like Fastly means that the actions of other users can impact your IP's reputation. Therefore, you should focus on ensuring your own website's security and content are not triggering blacklists. Monitoring website traffic and loading speeds is crucial. If the listing significantly impacts website performance or accessibility, consider contacting your hosting provider, exploring alternative CDNs, or migrating to a different IP address. Additionally, verify that DNS records are valid and secure and that no open resolvers are running.
Key opinions
- Limited Direct Email Impact: Spamhaus listing of a Fastly IP range primarily impacts website accessibility, not email deliverability, if you don't send email from that IP.
- Shared IP Reputation: CDNs use shared IP ranges, so the actions of other users can affect your IP's reputation.
- Website Accessibility Risk: The primary concern is the potential negative impact on website loading speeds and accessibility for some users.
- DNS Importance: Ensure DNS records are valid and secure. Check if you are running an open resolver.
- Security: Website being listed can lead to security compromises, install WAF to prevent malicious activity.
Key considerations
- Monitor Website Performance: Continuously monitor website traffic, loading speeds, and accessibility to identify any negative impacts from the listing.
- Investigate Spamhaus Listing: Contact Spamhaus to understand the specific reasons for the listing and any steps you can take to help resolve the issue (though direct action might be limited).
- Contact Hosting Provider: Contact your hosting provider to investigate the issue and potentially migrate your website to a different IP address.
- Evaluate Alternative CDNs: If the listing significantly impacts website performance, explore alternative CDN providers.
- Ensure website content is clean: Ensure that your website content is clean and that you are using a WAF to protect yourself.
Marketer view
Email marketer from DNSTool explains to check your DNS records and ensure that they are valid. Ensure that you are not running an open resolver which can get the IP listed and cause related issues.
3 Jun 2025 - DNS Tool
Marketer view
Email marketer from Quora shares that Check if your website is also listed in other blacklists. Implement security measures like a WAF (Web Application Firewall) to prevent malicious activity that might affect your website's reputation.
29 Apr 2025 - Quora
What the experts say
6 expert opinions
If your website resides on a Fastly IP range listed on Spamhaus, but you do not send email from that IP, the primary concern shifts to potential impacts on website accessibility and reputation, rather than email deliverability. While the listing might not directly affect email sending, it could indicate broader issues, such as the IP range being used for malware distribution. If you experience issues, first investigate whether it is two separate issues rather than just the spamhaus listing. Check who to contact depending on listing including contacting your hosting provider, isolating to a dedicated IP, and potentially migrating away from your current host or CDN. Actively monitor hard bounces and website traffic and speeds to isolate any issues.
Key opinions
- Limited Direct Impact: If you don't send email from the listed IP, the direct impact on email deliverability is limited.
- Website Accessibility is Key: The primary concern is website accessibility, as some networks might block access to websites hosted on the listed IP range.
- Shared IP Responsibility: Shared IP spaces mean you may not have direct control over the IP's reputation. Actions of others can impact you.
- Potential Malware Indication: The listing could indicate that the IP range is being used for malware distribution, even if you're not directly involved.
Key considerations
- Investigate the Listing: Determine the specific reason for the Spamhaus listing and who is responsible.
- Contact Hosting Provider: Contact your hosting provider to investigate and potentially migrate to a different IP range.
- Consider Alternative Hosting: Explore alternatives to GitHub hosting or your current CDN if the listing significantly impacts your website.
- Monitor for Hard Bounces and Traffic: Actively monitor website traffic and hard bounces to detect any adverse effects.
- Isolate Issues: Determine that any issues experienced are due to spamhaus listing, and not another issue.
Expert view
Expert from Email Geeks questions if the hard bounces are indeed due to the Spamhaus listing, noting that the listing has been active for almost a month and the IP in the bounce message is different, indicating it could be a separate issue.
12 Dec 2022 - Email Geeks
Expert view
Experts from Email Geeks confirm there is nothing to do regarding the Fastly+Spamhaus listing of the /24 the site is on.
3 Jun 2024 - Email Geeks
What the documentation says
5 technical articles
If your website is on a Fastly IP range listed on Spamhaus but you do not send email from that IP, the documentation highlights the importance of understanding that you may not be the source of the problem due to shared IP ranges. Website access for some users may be impacted. Focus on ensuring your specific usage doesn't contribute to abuse and securing your website to prevent malware and hacking attempts, which can lead to IP blacklisting. A proper reverse DNS setup is also important. Contact the provider of the IP.
Key findings
- Not Always Your Fault: A listing doesn't always mean you are the source of the problem; it could be a shared IP range.
- Impact on Website Access: If you aren't sending email, a Spamhaus listing might affect website access for some users.
- Shared Infrastructure: Shared infrastructure means occasional listings are unavoidable, according to Fastly.
- Website Security is Key: A compromised website can be used for malicious activities that lead to IP blacklisting.
- Contact the correct provider: Contact the provider of the IP range.
Key considerations
- Ensure Responsible Usage: Focus on ensuring your specific usage doesn't contribute to abuse.
- Secure Your Website: Secure your website to prevent malware and hacking attempts.
- Check DNS Records: Ensure your DNS records are correctly configured, including reverse DNS.
- Contact Support: Contact Fastly support if you believe the listing is impacting your services.
Technical article
Documentation from DigitalOcean explains the importance of a proper reverse DNS setup. Although this is more relevant for mail servers, ensure your DNS records are correctly configured, as incorrect DNS settings can sometimes contribute to reputation issues, even if you're not sending mail from the listed IP.
19 May 2024 - DigitalOcean.com
Technical article
Documentation from Google Search Central emphasizes securing your website to prevent malware and hacking attempts. Even if you're not sending email, a compromised website can be used for malicious activities that lead to IP blacklisting.
6 Jan 2025 - Google Search Central
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