A CLEARER START FOR EVERY CAMPAIGN
Better lists.
Stronger campaigns.
Your next great campaign deserves a better starting point.
Verify your email list. Understand every result. Send with confidence.
Agency-sample.csv
What is MailGuard?
MailGuard is an email verification tool for checking single addresses or bulk CSV/TXT lists before a campaign. It returns Passed, Failed, and Unknown results with a reason for each, so you can clean your list and export only what you trust.
Passed
The address passed the checks and looks deliverable. Uses 1 credit.
Failed
Invalid, non-existent, or rejecting mail. Uses 1 credit.
Unknown
No clear answer, often a catch-all domain. Free, so it uses no credits.
Who uses MailGuard
No monthly subscription · Credits never expire · Unknown results use no credits · Export filtered results
Explore bulk email verification, email list cleaning, pay-as-you-go pricing, the FAQ, and our data and security overview. Verification helps reduce uncertainty before sending. It doesn't replace consent, list hygiene, or deliverability best practices.
LESS GUESSWORK. MORE CLARITY.
Make the next send
your best-prepared one.
From a single address to your next client list, get the context you need to make a thoughtful sending decision.
A whole list.
A clearer picture.
Bring your CSV or TXT. Review addresses and duplicates, then follow your list through verification.
Meet your new workflowOne address.
All the context.
A focused check for the moments you don’t need a spreadsheet.
The result is just
the beginning.
Separate passed, failed, and unknown results. Review the reasons and export what you need.
BUILT AROUND YOUR WORKDAY
A thoughtful workflow.
From first upload to final handoff.
Prepare campaigns, review client lists, and keep the reasons with the results.
Bring your list
Upload CSV or TXT files up to 10 MB. Select your email column and review duplicates.
Get the full picture
Follow processing progress, then review verification checks and the signals behind each result.
Make your next move
Export all results or separate them by status. Take useful context into your next client handoff.
YOUR LIST IS YOUR BUSINESS
Know what happens
behind the scenes.
Understand how your addresses are verified, where account data is stored, and how checkout works before you upload.
- VerificationBulkEmailChecker
- Account & result storageSupabase
- PaymentsPayPal
BUY WHAT YOU NEED. WHEN YOU NEED IT.
Great campaigns don’t
need another subscription.
Choose a credit package that fits your next list. See the total and per-credit price before you buy.
Find your packageBEFORE YOU GET STARTED
Good questions.
Clear answers.
Want to talk through your workflow?
Talk to our teamWhat does an email verification result tell me?
MailGuard reports passed, failed, or unknown results from its verification provider, alongside checks and flags. A passed result is not a guarantee of inbox delivery, consent, or future mailbox availability.
Which results use credits?
Passed and failed results use one credit per address. Unknown results use no credits. Duplicate addresses are removed from a bulk list before verification. Credits do not expire.
What can I upload?
Bulk verification accepts CSV and TXT files up to 10 MB. You can preview the list and select the email column before starting. Results can be exported by status.
How are uncertain addresses handled?
Catch-all domains and temporary server restrictions can prevent a conclusive answer. Review unknown results and their reasons separately rather than treating them as confirmed valid addresses.
A BETTER LIST IS A BETTER BEGINNING
Your next campaign.
With a little more confidence.
Create your account. Choose your credits. Get to know your list.
Get started with MailGuard