Protect your deliverability, remove fake and invalid emails, and send campaigns with confidence using reliable bulk email verification.
Used by SaaS teams, agencies, and growing businesses worldwide.
Sending emails to unverified lists leads to:
Most teams realize this after performance drops – when the damage is already done.
Deliverability damage compounds quietly.
One bad list can affect inbox placement for weeks or months — even after it’s cleaned.
Verifying lists before campaigns go out is the safest way to protect results.
Sending campaigns to unverified lists can quietly damage deliverability, waste spend, and skew performance metrics.
MailCleanup is built for bulk email verification, allowing teams to upload large lists and accurately identify invalid, fake, and risky addresses before they’re used.
Clean lists lead to better inbox placement, lower bounce rates, and more reliable campaign results.
Each check is designed to reduce bounces and protect deliverability – not just “label emails.”
Clean existing user databases and mailing lists before product, onboarding, or lifecycle campaigns. As user bases grow over time, email data naturally degrades due to job changes, inactive accounts, and invalid signups.
Verifying lists before campaigns helps SaaS teams protect sender reputation and ensure important product communications actually reach real users.
Why it matters:
Verify email lists before every campaign to protect client sender reputations and campaign performance. Agencies often work with imported, segmented, or client-provided lists where data quality can vary significantly.
Bulk verification ensures campaigns are sent only to valid addresses, reducing risk for both agencies and their clients.
Why it matters:
Ensure customer and subscriber data stays accurate and usable across promotions, newsletters, and customer communication. Over time, customer email lists collect invalid, abandoned, or unreachable addresses that quietly reduce campaign effectiveness.
Cleaning lists before major sends helps e-commerce and CRM teams maintain healthy engagement and reliable communication.
Why it matters:
Safely clean migrated or old email databases before reactivating or using them in campaigns. Legacy lists often contain outdated, risky, or low-quality emails that can trigger deliverability issues if used without verification.
MailCleanup helps identify which parts of these lists are still usable — and which should be removed.
Why it matters:
MailCleanup isn’t built for shortcuts or list flipping.
It’s built for teams that care about deliverability safety and long-term results.
From a few thousand emails to millions per upload, MailCleanup handles volume reliably without sacrificing verification accuracy.
I just can’t begin to thank MailCleanup for their service. Their support was exceptionally good. They helped me understand how cleaning their list would benefit my organization and me. They also helped me with my duplicate email data.
I also loved some of its high-tech features. Lastly, the delivery of our cleaned email list was also fast. No complaints whatsoever.
Soham B.
IoT Engineer
I love MailCleanup. It’s the best service for cleaning my email lists, and we’ve been using it for a while now.
With MailCleanup, I can get rid of all the invalid and expired addresses that were present in our subscriber lists.
Their support team also deserves all the applause.
Abhishek M.
Front Office Associate
MailCleanup has the most affordable pricing plans as compared to other services. They didn’t compromise with the quality even after providing different cost effective plans which can be purchased by any individual regardless of their budget.
I simply selected the plan according to my list size and got the verified list emailed to me directly within a short span of time.
Ayush U.
Senior Operations Analyst
How does MailCleanup work?
MailCleanup is built for simple bulk email verification. After making a one-time payment, you upload your email list in CSV format. Our system processes the list through multiple verification checks, and once complete, you receive the cleaned results.
How accurate is MailCleanup?
MailCleanup delivers up to 99% verification accuracy by combining syntax checks, domain validation, MX record detection, SMTP verification, and risk indicators. Accuracy may vary slightly depending on list quality and domain behavior.
Does MailCleanup work with Gmail, Outlook, and business email providers?
Yes. MailCleanup verifies email addresses across major providers such as Gmail, Google Workspace, Outlook, Microsoft 365, and custom business domains as part of the bulk verification process.
Will using MailCleanup improve inbox placement or prevent emails from going to spam?
MailCleanup helps reduce common deliverability issues by removing invalid, risky, and low-quality email addresses before campaigns are sent. While inbox placement depends on multiple factors, clean email lists are a critical foundation for better deliverability.
How long does the verification process take?
Processing time depends on the size of your list and how quickly email servers respond. Smaller lists may complete in minutes, while larger lists can take a few hours. You’ll be notified once the process is complete.
What file formats are supported for uploads?
Currently, MailCleanup supports email list uploads in CSV format only. This helps ensure consistent processing and reliable results for large lists.
How does MailCleanup pricing work?
Pricing is based on the number of email addresses you want to verify. You select a credit package that matches your list size and use it for bulk email verification. There are no subscriptions or recurring charges.
What happens to unused email verification credits?
MailCleanup is designed for one-time bulk list verification. We recommend purchasing credits based on the size of the list you intend to clean and using them in a single upload.
At this time, unused credits are not automatically stored for future use. In specific cases, we may manually assist customers with credit usage – please contact our support team if you have questions before purchasing.
Do you offer custom or high-volume plans?
Yes. If you need to verify more than 1 million email addresses, we offer custom pricing based on volume. Please contact our team to discuss your requirements.
What is your refund policy?
Email verification begins shortly after list submission. Once the cleaning process has started or is completed, refunds are not available. If you encounter an issue before processing begins, please contact our support team immediately.
Protect your deliverability and campaign performance with reliable bulk email verification.
