There’s nothing more frustrating than spending hours on planning, research, preparation, and finally launching your email campaign — only to find out you’ve made it to a spam list and your emails go straight to the junk folder. Getting to a spam list is a major setback that affects your sender reputation, email deliverability, and all marketing efforts.
In this guide, we’ll break down what spam email lists are, how to remove your email from these lists, and, most importantly, how to avoid ever ending up on one.
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What is a spam email list?
A spam email list is a collection of email addresses, domains, or IPs that have been flagged for sending out unwanted emails, usually spam. Once an email is on such a list, it can’t be used to send legitimate emails anymore.
These lists are maintained by organizations, email service providers, and anti-spam groups whose job is to identify sources of spam and prevent those emails from reaching inboxes.
Is a spam list the same as a blacklist?
A spam email list and a blacklist are similar but not the same.
Email providers and anti-spam groups use spam email lists to track sources of unwanted emails, identify, and filter them. It means that you would still be able to send emails, but they’re very likely to be marked as spam from the start.
While all spam lists are part of blacklists, blacklists are broader and cover more than just spam. They also target harmful entities, such as those involved in phishing. Blacklists are specifically designed to block emails from reaching inboxes, meaning your emails will likely be hard-bounced and never make it to the recipient’s inbox.
To learn more about how blacklists work and how to avoid them, check out our dedicated blog post on email blacklists.
How are spam email lists created?
Spam email lists are created through a combination of automated monitoring, spam filters, and user feedback.
Automated monitoring tracks behaviors that could signal spammy activity, like sudden sending spikes, using unauthorized sending methods, or sending emails to invalid or non-existent addresses.
The monitoring is performed by email service providers (ESPs) like Gmail, Yahoo, or Outlook and anti-spam organizations like Spamhaus.
If automated monitoring flags an email account, domain, or IP, it is very likely to be added to a spam email list or blacklist.
ESPs also rely on spam filters that check incoming emails for characteristics commonly associated with spam, like misleading subject lines, suspicious links, spammy words, and attachments.
If an email fails the check, spam filters send it to the junk email folder. Also, spam filters track recurring suspicious behavior from the same email sender and automatically treat future emails as spam.
Finally, if a lot of recipients mark an email as spam, an ESP will take this feedback into account when evaluating future emails from you. In such cases, your emails may be flagged as spam, even without technical violations.
Examples of spam email lists
There are several well-known spam email lists maintained by different organizations:
- Spamhaus is an international nonprofit organization that maintains spam email lists and provides threat intelligence services, such as data query, real-time threat monitoring, and BGP-based firewall solutions.
- Spamcop. An anti-spam service that collects spam complaints from users and analyzes email headers to track down the sources of spam.
- Lashback is a leading provider of compliance services, brand protection, and marketing intelligence for digital marketers. Lashback maintains a spam email list and offers services like ComplianceMonitor and ListMonitor to help businesses make sure they aren’t linked to spam or malicious email activity.
Here are some other spam email lists that focus on tracking and blocking IP addresses (and sometimes domains) used for sending spam or involved in spam-related activities:
- Passive Spam Block List (PSBL). Maintained by the Spamhaus Project, this list is primarily focused on IPs rather than email addresses or domains. When an IP address is identified as sending spam, it gets added to the PSBL.
- UCEPROTECT was created by a German internet security expert as a response to the increasing threat of spam and to help improve email security by providing a blocklist for email service providers and network administrators.
- Exploits Block List (XBL) is another list maintained by Spamhaus that specifically targets IP addresses used by compromised machines, botnets, and malware to send scam emails.
How to check if your email is in a spam email list?
If you suspect that your email, IP, or domain was flagged as spam—and that’s easy to suspect once your entire email campaign is bounced or sent to the spam folder—you need to check your assumption. Here is how to do that:
- Check bounce-back messages. If many emails bounced back, start by checking the bounce-back emails or delivery failure notifications from your email delivery platform. These messages often include error codes and specific reasons for delivery failure (e.g., IP blocked, spam complaints, server issues). Look for sections in the message that mention why your email was rejected or why it was marked as spam.
- Check your sender reputation. If you see (in an ESP dashboard) that many of your emails went to spam, check your sender reputation using tools like Sender Score, Google Postmaster Tools, or SenderBase. A low sender reputation can cause email providers to treat your emails as spam, even if you’re not on any blacklists.
- Check if you’re listed on blacklists or spam lists. Use tools like Spamcop Blocklist Lookup, Spamhaus Blocklist Lookup, or Lashback ListMonitor to check if your IP address or domain was added to any spam lists.
- Review user feedback. Start by checking your ESP’s reports for any spam complaints or issues. Some ESPs allow you to view feedback loops—make sure to check them. If your ESP doesn’t provide this feature, register with platforms like Gmail or Microsoft to access their feedback loops. With this data, you can see how many people have marked your emails as spam.
- Check your email content. This step should go before the email dispatch, however, if you have forgotten to do that in advance and now the problem occurred, you might want to scan your email for potential spam triggers to make sure it was a one-time problem. In the last section, I’ll give you the best tool to do that.
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