Is gmail10p.com a legitimate domain or a spamtrap?
Matthew Whittaker
Co-founder & CTO, Suped
Published 12 May 2025
Updated 17 Aug 2025
7 min read
When reviewing bounce logs, encountering unfamiliar domains can raise questions about their legitimacy. One such domain, gmail10p.com, has recently come up, prompting inquiries into whether it's a legitimate email destination or a form of spam trap. The bounce message received, "451 4.3.0 Failed to egress. 0QL3NKO1HAJZ," adds to the confusion, indicating an issue with email delivery, potentially related to Cloudflare or the receiving server's configuration.
My investigation into gmail10p.com reveals that it is not a standard, legitimate domain for regular email communication like gmail.com. Instead, it appears to be a disposable email domain. Such domains are typically used for temporary email addresses that are designed to expire quickly or be deleted after a short period, often to sign up for services without revealing a primary email address or to bypass registration requirements.
Understanding gmail10p.com
Understanding gmail10p.com
Gmail10p.com is flagged by several email validation services as a disposable or temporary email domain. This classification suggests that email addresses associated with this domain are likely to be used for abusive or fraudulent activities, rather than for legitimate communication. Services like IPQualityScore and Tomba explicitly list it as a disposable domain, indicating its nature.
The fact that it contains "gmail" might lead some to believe it is related to gmail.com (google.com), but it is not. This naming convention is often used to mislead or to create what are known as typo domains. These domains mimic legitimate ones, hoping to catch misspellings or to appear credible to unsuspecting users. Such domains are frequently utilized in phishing scams, spam campaigns, or for creating temporary, untraceable email accounts.
The bounce message you encountered, "451 4.3.0 Failed to egress," suggests a temporary failure. While this particular error can sometimes indicate a server configuration issue on the receiving end, when combined with a domain like gmail10p.com, it reinforces the likelihood that the domain is not intended for reliable, ongoing email delivery. It could be an inactive disposable address, or part of an infrastructure specifically designed to detect or trap suspicious email activity.
The role of spam traps
The role of spam traps
Spam traps (also known as honeypots) are email addresses used by internet service providers (ISPs), anti-spam organizations, and blocklist operators to identify and monitor senders who are not following email best practices. These addresses are not meant for legitimate communication and can be created in several ways, including pristine spam traps (newly created addresses never used by a real person) or recycled spam traps (old, abandoned email addresses reactivated as traps). If you send an email to a spam trap, it's a clear signal that your email list acquisition or hygiene practices are flawed.
While gmail10p.com is primarily a disposable email domain, it can certainly function as a source for spam traps. Typo domains, which closely resemble popular email providers, are frequently used to set up these traps. Sending to such a domain, even if it's a genuine typo from a user, can still flag your sending activity as suspicious if the domain is monitored for abusive traffic. For more information on how these traps work, refer to our guide on what spam traps are.
It is a common misconception that spam traps never engage with emails (e.g., opens or clicks). While many do not, some advanced spam trap operators deliberately trigger opens or clicks to make their traps less detectable. This means that even if you observe engagement from an email address on a suspicious domain like gmail10p.com, it doesn't automatically validate the address as legitimate or human-controlled. You can learn more about this in articles discussing how to avoid spam trap email addresses.
Impact on sender reputation
Impact on sender reputation
Sending emails to disposable domains or spam traps can severely impact your sender reputation. ISPs and anti-spam systems use these traps to gauge the quality of your mailing list and your sending practices. Frequent hits on spam traps indicate poor list hygiene or potentially spammy sending behavior, which can lead to negative consequences for your email deliverability.
When your domain or IP address is identified as sending to spam traps, it can result in your emails being marked as spam, throttled, or even entirely blocked by mailbox providers. This can lead to your IP or domain being added to various email blocklists (or blacklists), which significantly harms your ability to reach the inbox. Understanding what happens when your domain is on a blocklist is crucial for maintaining good deliverability.
The cumulative effect of hitting spam traps can be a decline in your domain's reputation with major mailbox providers like Google and Yahoo. A low domain reputation means your legitimate emails are more likely to end up in the spam folder, even if your content is relevant and your recipients are engaged. This underscores the importance of proactive list management and validation.
The risks of sending to gmail10p.com
Reduced sender reputation: Mailbox providers may view your sending practices as suspicious.
Blocklisting: Your domain or IP could be added to an email blacklist (or blocklist), preventing delivery.
Poor inbox placement: Legitimate emails might end up in the spam folder or be rejected.
Protecting your deliverability
Protecting your deliverability
To prevent your emails from bouncing or landing in spam folders due to domains like gmail10p.com, robust email list hygiene and validation practices are essential. This means regularly cleaning your email lists and using a reliable email validation service at the point of signup to identify and remove invalid, temporary, or suspicious addresses.
One key step is to implement a strict email validation process for all new sign-ups. This can help you catch disposable email addresses before they even enter your mailing list. For existing lists, regular re-engagement campaigns can help identify inactive or invalid email addresses. Addressing these issues proactively is critical for long-term email success and to prevent hitting spam traps.
Best practices for email list hygiene
Use real-time validation: Implement email validation at the point of subscription.
Regular list cleaning: Remove inactive and invalid email addresses frequently.
Monitor bounces: Pay attention to hard bounces and remove those addresses promptly.
Segment inactive users: Isolate and try to re-engage, or remove, subscribers who haven't opened in a long time.
Additionally, staying informed about suspicious email domains and common spam trap networks is crucial. Tools that help identify suspicious email domains can be invaluable. Regularly reviewing your sending practices against industry best practices will help you maintain a healthy sender reputation and avoid deliverability issues, ensuring your legitimate emails reach their intended recipients. Learn more about email deliverability issues and how to address them.
Final thoughts on suspicious domains
While gmail10p.com might appear similar to legitimate email providers, it is classified as a disposable email domain. Emails sent to this domain, especially when bouncing with 451 4.3.0 Failed to egress, are strong indicators of either an invalid address, a temporary email service, or a potential spam trap. Maintaining a clean and validated email list is paramount to preserving your sender reputation and ensuring high email deliverability. Always be vigilant for suspicious domains and actively manage your subscriber lists to avoid unnecessary bounces and blocklist issues.
Views from the trenches
Best practices
Always validate email addresses at the point of collection to filter out disposable or invalid domains early.
Regularly clean your email lists by removing inactive subscribers and hard bounces.
Monitor your email deliverability metrics and bounce rates for unusual patterns or spikes.
Common pitfalls
Ignoring bounce messages from unfamiliar domains, which can mask spam trap hits or invalid addresses.
Failing to implement real-time email validation, leading to a build-up of bad addresses.
Relying solely on open or click data to determine the legitimacy of an email address.
Expert tips
If a domain looks like a typo of a major provider (e.g., gmail10p.com), treat it as suspicious until proven otherwise.
Even if a spam trap shows engagement, it does not mean it's a legitimate user; some traps are designed to appear active.
A high volume of bounces from a specific domain may indicate a network of temporary or fake addresses.
Marketer view
Marketer from Email Geeks says that if a domain is formatted unusually, like containing numbers or slightly altered brand names, it is highly likely to be a typo domain or a disposable address.
2024-04-10 - Email Geeks
Expert view
Expert from Email Geeks says that 'failed to egress' is a Cloudflare error indicating issues with the receiving domain's email handling, and combined with a domain resembling a major brand like Gmail, it points to a spamtrap or a garbage domain.
gmail.com. Instead, it appears to be a disposable email domain. Such domains are typically used for temporary email addresses that are designed to expire quickly or be deleted after a short period, often to sign up for services without revealing a primary email address or to bypass registration requirements.
gmail.com (google.com), but it is not. This naming convention is often used to mislead or to create what are known as typo domains. These domains mimic legitimate ones, hoping to catch misspellings or to appear credible to unsuspecting users. Such domains are frequently utilized in phishing scams, spam campaigns, or for creating temporary, untraceable email accounts.
