Upload your email list and get back only the addresses that have passed deep, multi-layer verification –
so every campaign goes out to emails that are actually real.
Used by SaaS teams, agencies, and growing businesses worldwide.
Every unverified email list carries three problems that compound on each other.
The Risk: Unverified lists contain spamtraps, catch-all domains, and high-risk addresses that email providers watch for. Send to enough of them and your domain gets flagged – sometimes permanently.
The Inaccuracy: Not every address that looks valid is real. Fake signups, mistyped addresses, and inactive accounts pass basic checks but fail at the inbox.
The Cost: Every credit spent sending to an invalid address is wasted. Every bounce and spam complaint chips away your sender reputation.
The only way to avoid all three is to verify every address – deeply – before your campaign goes out.
MailCleanup is built for bulk email verification – allowing teams to upload large lists and run every address through 12+ validation layers before a single campaign goes out.
What comes back isn’t just a cleaner list. It’s a verified list – one where every address has been confirmed real, checked for risk, and cleared for sending.
Bulk email verification isn’t just a technical step. It’s what separates campaigns that perform from ones that don’t.
Every address that makes it through verification has been confirmed deliverable. That means fewer hard bounces, fewer soft bounces, and an ESP that keeps trusting your domain.
Verified lists signal clean sending behaviour to email providers. Clean behaviour means better inbox placement - across every campaign, every ESP, every send.
When every address on your list is real, your open rates and click rates reflect genuine interest - not noise from addresses that were never going to engage anyway.
Spamtraps, catch-alls, and high-risk addresses don't just hurt one campaign - they follow your domain. Verifying before you send is the only way to keep your reputation intact long-term.
Stop paying to email addresses that were never real. A verified list means every credit, every send, and every campaign is directed at someone who can actually receive it.
Most tools run basic checks. MailCleanup verifies deeper – so nothing that shouldn’t be on your list makes it through.
Every check is designed to confirm what’s real and remove what isn’t – not just label emails and call it done.
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.
How does bulk email verification work?
After making a one-time payment, upload your email list in CSV format. MailCleanup runs every address through 12+ validation layers – syntax checks, domain verification, MX record detection, SMTP verification, spamtrap detection, and more. Once complete, your verified list is delivered straight to your inbox with full documentation on every address flagged or removed.
Does MailCleanup verify emails from Gmail, Outlook, and business providers?
MailCleanup verifies email addresses across all major providers including Gmail, Google Workspace, Outlook, Microsoft 365, and custom business domains as part of the bulk verification process.
Does verifying my list guarantee zero bounces?
Verification significantly reduces bounce rates by identifying and removing addresses confirmed as invalid, risky, or undeliverable. However, no verification tool can guarantee zero bounces – email data changes constantly and some addresses may become inactive between the time of verification and the time of sending.
How accurate is MailCleanup's email verification?
MailCleanup delivers up to 99% verification accuracy by combining multiple validation layers – syntax checks, domain validation, MX record detection, SMTP verification, and risk indicators. Accuracy may vary slightly depending on list quality and how individual mail servers respond during verification.
Can you verify a purchased or third-party email list?
Yes. Purchased, imported, and third-party lists carry the highest risk of containing unverified, invalid, and risky addresses. Verifying before use is strongly recommended – especially before cold outreach or reactivation campaigns where data quality is unknown.
What does SMTP verification actually check?
SMTP verification connects directly to the recipient’s mail server and confirms whether the specific email account exists – without sending an actual email. It’s one of the deepest verification checks available and catches addresses that pass basic syntax and domain checks but don’t actually exist at the inbox level.
How long does verification take?
Processing time depends on list size and how quickly mail servers respond. Smaller lists may complete in minutes, while larger lists can take a few hours. You’ll be notified once your verified list is ready.
What happens to catch-all email addresses after verification?
Catch-all domains are configured to accept every incoming email regardless of whether the specific address exists. MailCleanup identifies and flags these addresses during verification – since their delivery is unpredictable, they’re separated from your verified list so you can decide how to handle them.
What file format do I need to upload?
MailCleanup currently supports CSV format only. This ensures consistent processing and reliable results across large lists.
How does pricing work?
Pricing is based on the number of email addresses you want to verify. Select a credit package that matches your list size and use it when you need it. No subscriptions, no monthly plans, no automatic renewals – you only pay for what you verify.
Do you offer custom plans for large lists?
Yes. For lists exceeding 1 million email addresses, custom pricing is available based on volume. Contact [email protected] to discuss your requirements.
What is your refund policy?
Verification begins shortly after list submission. Once the process has started or is completed, refunds are not available. If you encounter an issue before processing begins, please contact our support team immediately.
Stop sending to addresses you can’t trust. Verify your list before your next campaign goes out.
