Your emails land in spam, or your website shows a warning, or both. People often call both problems "being blacklisted", but they come from different systems.
Understanding the difference saves time, because the fix for one does nothing for the other.
Key takeaways
- Email reputation is about how you send. Website blocklisting is about what your site hosts.
- They use different lists, different owners and different removal processes.
- A website blocklisting can still hurt email, because filters check links inside messages.
- Diagnose both before you start any removal requests.
What email domain reputation is
Email reputation measures how trustworthy your domain and sending IPs are as a sender. Mailbox providers like Gmail and Outlook, and blocklists such as Spamhaus and SURBL, look at:
- Spam complaints and bounce rates.
- Authentication: SPF, DKIM and DMARC.
- Sending volume and sudden spikes.
- Spam-trap hits and purchased or old lists.
- The reputation of links and domains inside your messages.
What website blocklisting is
Website blocklisting is about what your site does to visitors. Vendors such as Google Safe Browsing, antivirus engines and web filters flag a domain when they detect malware, phishing, unwanted software or suspicious behaviour. The result is browser warnings, antivirus blocks and firewall blocks.
How they affect each other
The two systems are separate, but they overlap in one important way: mail filters check the links inside your emails. If your website domain is blocklisted for phishing or malware, every email that links to it, including your own newsletters and invoices, can be marked as spam or dangerous.
The opposite also happens. A domain abused for spam, for example through a compromised contact form, can end up on URL blocklists that also feed web filters.
How to tell which one you have
Use these quick checks:
- Only emails affected, website loads fine everywhere: likely an email reputation issue. Check bounce messages, your DMARC reports and email blocklists.
- Website shows warnings, emails also go to spam: likely a website blocklisting affecting links in your emails. Check VirusTotal and Search Console.
- Only some business customers cannot open your site: likely a web filter category or verdict.
Our article on domain blacklist versus email blacklist has a side-by-side comparison.
Fixing each one
For email reputation: fix authentication, clean your lists, stop the spam source and request delisting from the specific email blocklists. For website blocklisting: clean the site and request a review from each security vendor, as described in our full blacklist playbook. When both are affected, start with the website listing, because it often causes the email problem.
Frequently asked questions
Can my email be fine while my website is blocked?
Yes, especially if your emails do not link to the flagged domain. In practice most business emails do, so both are often affected.
Will setting up DMARC fix a website blacklisting?
No. DMARC improves email authentication but has no effect on security vendor verdicts about your website.
Do I need different tools to check each?
Yes. Email blocklist checkers cover mail lists, while VirusTotal and Search Console cover website verdicts.
Which one is more urgent?
Website blocklistings usually cause more immediate damage, because they block visitors and email links at the same time.