Where can I find a current list of disposable email domains for email suppression?
Matthew Whittaker
Co-founder & CTO, Suped
Published 14 Aug 2025
Updated 19 Aug 2025
8 min read
Managing email deliverability often involves navigating complex issues, and one of the persistent challenges is dealing with disposable email domains (DEDs). These are temporary email addresses that users acquire for short-term purposes, often to sign up for services without revealing their primary email address, to avoid spam, or to exploit free trials.
While they offer users a layer of privacy, for senders, DEDs can be problematic. They typically lead to low engagement, high bounce rates, and ultimately, can harm your sender reputation. Including these addresses in your email lists can skew your analytics and potentially trigger spam filters, pushing your legitimate emails into junk folders or even leading to your domain being placed on a blocklist (or blacklist).
The core question then becomes: where can you find a current, comprehensive list of these disposable email domains for effective suppression? It is not as straightforward as it might seem, as the landscape of temporary email providers is constantly evolving.
Effective suppression of these addresses is a crucial part of maintaining a healthy email program and ensuring strong deliverability. We need reliable methods to identify and exclude them from our sending lists.
Publicly available lists and their limitations
Many people first turn to publicly available resources when looking for disposable email domain lists. GitHub repositories are a popular starting point, as various developers and communities compile and share lists of known DEDs. These repositories can offer a substantial collection of domains that are commonly used for temporary email services.
The primary issue is the dynamic nature of disposable email services. Many of these providers frequently change their domains to evade detection, meaning a static list can become outdated very quickly. What was current last week might already be missing new DEDs today. This makes maintaining an up-to-date suppression list a continuous and challenging task if you are doing it manually.
Furthermore, some public lists may inadvertently include legitimate free email providers, which could lead to you blocking valid subscribers. It is essential to exercise caution and thoroughly review any list before implementing it into your suppression processes to avoid false positives and to ensure you are not missing out on genuine engagement.
The value of dynamic verification services
Given the rapid evolution of disposable email services, a static list, no matter how comprehensive initially, will inevitably fall behind. This is why many email marketers and deliverability professionals turn to more dynamic solutions, specifically email verification services. These services specialize in maintaining constantly updated databases of DEDs, often employing real-time checks and sophisticated algorithms to identify new patterns and domains.
These services provide APIs that allow you to integrate their verification capabilities directly into your signup forms or email collection processes. This real-time validation means that as soon as a user provides an email address, it can be checked against a continuously updated blacklist (or blocklist) of known disposable domains.
The benefits of using such services are substantial. They offer significantly higher accuracy than manual list compilation, automate the process of keeping your suppression list current, and, most importantly, help protect your sender reputation by preventing problematic addresses from entering your database in the first place. This proactive approach is far more effective than reactive cleanups based on static lists.
Many email verification services, such as WhoisXML API, offer dedicated disposable email domain data feeds or integrate this check into their broader validation services. These are typically maintained by dedicated teams that monitor the internet for new DED providers, allowing you to access a truly current list for your suppression efforts.
Implementing dynamic solutions and broader strategies
Static lists
Update frequency: Requires manual updates, quickly becoming outdated due to new DEDs.
Accuracy: May contain false positives or miss newly emerging disposable domains.
Effort: High manual effort for maintenance and integration into systems.
Dynamic verification services
Update frequency: Continuously updated databases and real-time API checks.
Accuracy: High accuracy with sophisticated detection mechanisms.
Effort: Low manual effort once integrated, largely automated.
Beyond simply getting a list, it is crucial to implement these lists effectively into your email infrastructure. This often involves integrating with your email service provider (ESP) or CRM to automatically suppress any detected disposable email addresses at the point of entry or during list cleaning processes. For those looking to proactively manage their lists, consider exploring best one-time email list cleaning services.
Another layer of protection comes from ensuring strong email authentication, such as DMARC. While DMARC does not directly suppress disposable email addresses, it helps to ensure that only legitimate emails from your domain reach inboxes, and provides valuable feedback that can indirectly help identify problematic sending patterns or sources of abuse that might involve DEDs. Monitoring your DMARC reports can offer insights into the types of emails being sent on behalf of your domain.
It is also worth noting that some major mailbox providers, such as Mailinator and Temp Mail, are specifically designed for temporary use and are almost always on disposable email domain blacklists (or blocklists). Other services, while not explicitly for disposable use, might also experience a higher rate of temporary accounts. Regularly verifying your email list helps identify potentially harmful domains and maintain good list hygiene.
The impact on deliverability and sender reputation
The risks of not suppressing
Failing to effectively suppress disposable email domains can have several detrimental effects on your email program and overall sender reputation. It can lead to inflated bounce rates, higher spam complaint rates, and a general decrease in engagement metrics, all of which signal negative behavior to mailbox providers.
Reputation damage: Frequent sending to DEDs can flag you as a spammer, impacting your domain reputation and leading to blocklisting.
Wasted resources: You spend money and resources sending emails that are unlikely to be opened or acted upon.
Skewed metrics: Your open and click rates may appear lower than actual engaged subscribers.
To effectively combat the issues posed by disposable email domains, it is not enough to simply have a list; you need a strategy. This includes regular email list verification and ongoing monitoring of your sender reputation. A robust suppression strategy helps ensure that your legitimate emails reach the inbox, rather than being diverted to spam folders or rejected outright.
Ultimately, the goal is to cultivate a clean and engaged email list, free from the drag of disposable or otherwise problematic addresses. This proactive approach improves your deliverability, maintains a positive sender reputation, and ensures your marketing efforts yield better results. For those wondering if you should block disposable email addresses, the answer is almost always yes.
It is also beneficial to understand the broader context of email security. Ensuring your email authentication protocols like SPF, DKIM, and DMARC are properly configured can provide a strong foundation for your email program. These measures help to validate your sending domain and reduce the likelihood of your emails being flagged as suspicious, even if you inadvertently encounter a few disposable email addresses.
Views from the trenches
Best practices
Integrate real-time email verification into your signup process to catch disposable emails at the source, preventing them from entering your list.
Regularly clean your email lists using a reputable email validation service to remove any DEDs that may have slipped through.
Monitor your sender reputation metrics, such as bounce rates and spam complaints, to identify potential issues caused by problematic addresses.
Common pitfalls
Relying solely on static, manually compiled lists of disposable email domains, which quickly become outdated and incomplete.
Ignoring the problem of disposable email addresses, leading to higher bounce rates and damage to your sender reputation.
Failing to integrate suppression lists with your email sending platform, allowing DEDs to receive emails.
Expert tips
Consider adjusting your acquisition strategies if you notice a high rate of disposable email sign-ups, as this might indicate an underlying issue.
A comprehensive blocklist (or blacklist) strategy should include more than just DEDs; it should also account for known spam traps and problematic domains.
Understand that even major providers like Gmail and Yahoo can be used for 'throwaway' purposes by users; your focus should be on user intent rather than just domain type.
Marketer view
Marketer from Email Geeks says that you can find many disposable email domain lists on GitHub.
2019-10-30 - Email Geeks
Expert view
Expert from Email Geeks warns that the largest disposable email providers can sometimes be Yahoo and Gmail, suggesting that if your acquisition process encourages their use, that is the root problem to address.
2019-10-31 - Email Geeks
Final thoughts on managing disposable email domains
Finding a truly current and comprehensive list of disposable email domains for suppression is an ongoing challenge due to the dynamic nature of these services. While public GitHub repositories offer a starting point, their static nature means they quickly become outdated. For robust and reliable suppression, dynamic email verification services are the most effective solution.
These services provide real-time validation against constantly updated blacklists (or blocklists) of DEDs, integrating seamlessly into your email processes to prevent problematic addresses from entering your list. This proactive approach not only saves resources but, more importantly, protects your sender reputation and improves your overall email deliverability. Learning more about how email blacklists actually work can further enhance your understanding.
Ultimately, effective suppression of disposable email domains is a critical component of healthy email marketing. By investing in dynamic solutions and maintaining consistent list hygiene, you can ensure your messages reach their intended recipients, fostering better engagement and protecting your valuable sender reputation.
Mailinator and 
Temp Mail, are specifically designed for temporary use and are almost always on disposable email domain blacklists (or blocklists). Other services, while not explicitly for disposable use, might also experience a higher rate of temporary accounts. Regularly verifying your email list helps identify potentially harmful domains and maintain good list hygiene.
