Summary
Finding a current list of disposable email domains (DEDs) for suppression is best achieved through dynamic, continuously updated resources rather than static, downloadable files. The most reliable sources are real-time email validation and list hygiene services, which maintain sophisticated, proprietary databases. While actively maintained open-source GitHub repositories offer useful and frequently updated lists for basic or custom suppression, they often cannot keep pace with the rapid evolution of DED services. Critically, relying solely on outdated static lists is ineffective, and caution must be exercised to avoid inadvertently blocking legitimate recipients from major free email providers often mistakenly included in some broader 'disposable' datasets.
Key findings
- Dynamic Nature of DEDs: Disposable email domains are highly dynamic, frequently changing or appearing, which renders static or manually updated lists quickly obsolete for effective, long-term suppression.
- Primary Sources for Detection: Professional email validation and list hygiene services, such as Kickbox, ZeroBounce, and Email Hippo, are the most reliable sources for identifying DEDs. They maintain extensive, continuously updated, proprietary databases and real-time APIs.
- Open-Source Resources: Actively maintained open-source GitHub repositories offer valuable, frequently updated lists of disposable domains that can be useful for foundational suppression efforts or integration into custom validation logic.
- Platform-Managed Suppression: Major email sending platforms like Mailgun, Twilio SendGrid, and SparkPost internally identify and automatically handle or block known disposable email addresses as part of their fraud prevention and deliverability maintenance efforts, rather than providing public lists.
- Risk of Over-Suppression: Some broader datasets, intended for disposable email detection, may mistakenly include legitimate common free email providers like Gmail and Hotmail. Using such lists without careful review can lead to blocking valid recipients and damaging deliverability.
Key considerations
- Prioritize Real-Time Validation: For the most accurate and up-to-date identification of disposable email domains, invest in a reputable third-party email validation service that offers real-time API-based checks.
- Combine Approaches: For a comprehensive strategy, consider integrating actively maintained open-source lists for initial screening or custom tools, alongside a professional email validation service for dynamic detection.
- Address Acquisition Issues: Focus on improving your email list acquisition processes to prevent disposable email addresses from entering your database initially, reducing the reliance on post-acquisition suppression.
- Understand List Limitations: Be aware that no single public list of disposable email domains is exhaustive or perpetually current. Static lists are quickly outdated and serve as a foundational, rather than a complete, solution.
- Beware of False Positives: Exercise caution with lists that might incorrectly categorize major free email providers like Gmail or Hotmail as disposable, as blocking these could negatively impact legitimate outreach and harm sender reputation.
What email marketers say
14 marketer opinions
For marketers seeking to identify and suppress disposable email domains (DEDs), relying on static lists is often ineffective due to their rapid obsolescence. The most reliable and current information is provided by real-time email validation services, which constantly update extensive, proprietary databases and offer API-based solutions for dynamic detection. While certain actively maintained open-source GitHub repositories can serve as a useful supplementary resource for custom suppression efforts, they typically cannot match the real-time vigilance of professional services. A critical consideration involves refining email acquisition practices to prevent DEDs from entering lists in the first place, and exercising caution to avoid blocking legitimate email addresses from major providers like Gmail or Yahoo, as such actions can inadvertently harm deliverability.
Key opinions
- Outdated Static Lists: Static lists of disposable email domains are quickly outdated because some services change domains frequently, even daily, rendering them unreliable for long-term suppression.
- Professional Validation Services: Professional email validation services, such as Email Hippo, Hunter.io, ZeroBounce, and Kickbox, are the most reliable sources for identifying DEDs. They maintain extensive, real-time, proprietary databases and offer this capability as a service, not a static list.
- Open-Source Resources: Actively maintained open-source GitHub repositories provide valuable, frequently updated lists of disposable domains that can be useful for foundational suppression efforts or integration into custom validation logic.
- ESPs' Internal Systems: Major email sending platforms like Twilio SendGrid and SparkPost manage internal lists to identify and block DEDs as part of their fraud prevention and deliverability maintenance efforts, rather than providing public lists.
- Risk of Blocking Legitimate Domains: Major providers like Yahoo and Gmail are occasionally used as disposable addresses, but blocking these providers outright can inadvertently harm deliverability by excluding legitimate recipients. Fixing the underlying acquisition process is often a better solution.
- Proprietary Data: The most effective and up-to-date disposable email domain detection lists are typically proprietary and integrated into commercial email verification services, rather than being publicly downloadable.
Key considerations
- Utilize Real-Time Verification: For the most accurate and current identification of disposable email domains, prioritize investing in reputable third-party email validation services that offer real-time API capabilities.
- Enhance List Acquisition: Focus on improving your email list acquisition processes to minimize the initial entry of disposable email addresses into your database, reducing the reliance on post-acquisition suppression.
- Avoid Static List Reliance: Understand that static, publicly available lists are quickly outdated and therefore insufficient for comprehensive and ongoing DED suppression due to the dynamic nature of these domains.
- Combine Resources: Consider leveraging actively maintained open-source GitHub repositories for initial screening or custom tools, alongside the more robust, real-time capabilities of commercial validation services.
- Protect Legitimate Subscribers: Exercise extreme caution not to mistakenly block legitimate users from major email providers like Gmail or Yahoo, even if these domains are sometimes used for disposable purposes; doing so can harm deliverability.
Marketer view
Email marketer from Email Geeks shares that a list of disposable email domains can be found on GitHub, providing a specific link to a gist.
21 Dec 2021 - Email Geeks
Marketer view
Email marketer from Email Geeks explains that major providers like Yahoo and Gmail are often used as disposable email addresses, advising to fix the underlying acquisition process instead of relying solely on suppression lists, as blocking these providers can harm deliverability.
6 May 2022 - Email Geeks
What the experts say
2 expert opinions
While some publicly available resources, such as Kickbox's GitHub repository, offer insights into disposable email domains, the most current and reliable lists are predominantly proprietary and maintained by specialized email validation and list hygiene services. These professional services keep dynamically updated databases to effectively identify and suppress problematic email addresses. It is also crucial for users to exercise caution, as some broader datasets intended for disposable email detection may incorrectly classify common free email providers like Gmail or Hotmail, risking the unintentional blocking of legitimate subscribers.
Key opinions
- Open-Source Lists Available: Some public platforms, such as GitHub, host lists of disposable email domains, with Kickbox's list being noted as an example by industry experts.
- Proprietary Service Data: Current and reliable lists of disposable email domains are primarily maintained as dynamic, proprietary databases by email validation and list hygiene services, rather than being publicly accessible for download.
- Risk with Broader Datasets: There is a concern that some broader 'disposable' datasets may erroneously include legitimate, widely used free email providers like Gmail and Hotmail, leading to potential over-suppression.
Key considerations
- Prioritize Specialized Services: For the most current and accurate identification of disposable email domains, rely on specialized email validation and list hygiene services that maintain dynamically updated, proprietary databases.
- Beware of False Positives: Exercise caution when using any list that might mistakenly include legitimate, common free email providers like Gmail or Hotmail, as suppressing these can inadvertently block valid subscribers and harm deliverability.
- Complementary Resources: While open-source resources like GitHub repositories can offer a starting point for identifying disposable domains, they are best used in conjunction with, or as a supplement to, the more comprehensive and real-time data provided by professional services.
Expert view
Expert from Email Geeks provides Kickbox's list of disposable email domains on GitHub and expresses concern about the Openprise dataset including common free email providers like Gmail and Hotmail in their "Free and Disposable List".
1 Jun 2025 - Email Geeks
Expert view
Expert from Word to the Wise explains that a current list of disposable email domains for suppression is typically maintained and provided by email validation and list hygiene services. These specialized companies keep dynamic databases to identify and help suppress various problematic email addresses, including disposable ones, as part of their services, rather than these lists being publicly available.
6 May 2025 - Word to the Wise
What the documentation says
5 technical articles
For those seeking lists of disposable email domains, various sources offer different levels of comprehensiveness and currency. Open-source repositories, particularly on GitHub, provide actively maintained and widely used plain-text lists that are frequently updated. Conversely, large email sending platforms like Mailgun primarily rely on their internal, continuously updated databases to identify and suppress DEDs, without making these lists publicly available. Furthermore, niche resources such as GitHub Gists offer smaller, manually curated lists, while anti-spam and abuse databases like StopForumSpam and AbuseIPDB can indirectly contribute data on domains often linked to malicious or disposable use, allowing for cross-referencing or integration into custom suppression systems.
Key findings
- Comprehensive GitHub Lists: Actively maintained, open-source GitHub repositories provide comprehensive, frequently updated plain-text lists of disposable email domains, widely used for system integration.
- Mailgun's Internal Databases: Mailgun and similar services internally identify and suppress disposable email domains using continuously updated proprietary databases, which are not publicly accessible.
- Smaller Curated Gist Lists: GitHub Gists offer smaller, manually updated, curated lists that can serve as quick references or foundational resources for personal or small-scale efforts.
- Anti-Spam Database Insights: StopForumSpam, while not a direct disposable email domain list, contains extensive records of spammer email addresses, many of which are disposable, and can be used for cross-referencing.
- AbuseIPDB Data: AbuseIPDB provides data on domains associated with malicious activity, often including disposable email addresses, which users can query for enhanced suppression.
Key considerations
- Diverse Data Sources: Utilize a combination of open-source lists and integrate insights from anti-spam and abuse databases for a more robust approach to disposable email domain identification.
- Dynamic vs. Static Lists: Recognize that actively maintained open-source repositories offer more current data than smaller, manually updated static lists, such as those found on Gists.
- Integration Capabilities: Assess the format of the list or data source to ensure it can be easily integrated into your existing email suppression or validation systems.
- Limitations of Public Lists: Be aware that comprehensive, real-time disposable email domain identification often occurs internally within major email service providers or specialized validation services, making public lists supplementary.
- Leveraging Indirect Data: Consider cross-referencing with databases like StopForumSpam or AbuseIPDB, as their records of problematic domains often overlap with disposable email usage, enhancing detection.
Technical article
Documentation from GitHub explains that an actively maintained, open-source repository provides a comprehensive, plain-text list of disposable email domains, which is frequently updated and widely used for integration into email suppression and validation systems.
10 Apr 2022 - GitHub
Technical article
Documentation from Mailgun explains that their email sending service internally identifies and handles disposable email addresses by automatically rejecting or suppressing messages sent to them, based on their continuously updated internal databases, rather than providing a publicly downloadable list.
24 Nov 2022 - Mailgun
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