Email Tools
Bulk Email Verifier
Verify email lists in the background, reserve one credit per non-empty email row, and get an email when your downloadable results are ready.
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How email verification works
Upload your list
Upload a CSV or TXT file with one email per row, or a CSV containing an email column.
Processing runs securely
Udecode checks each address and records the available syntax, domain, MX, and disposable-domain signals.
Download your results
When processing completes, receive an email and download the result CSV from your signed-in account.
Frequently Asked Questions
How are bulk verification credits used?
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One credit is reserved for each non-empty email row in an accepted file. Available credits depend on the active plan and current billing period.
Which file formats are supported?
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CSV and TXT files up to 10 MB are supported, with a maximum of 10,000 non-empty email rows per job.
Are result files private?
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Yes. Downloads require the account that submitted the job to be signed in. Result files are retained for 30 days.
Does verification prove that a mailbox exists?
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No. Syntax, domain, MX, and disposable-domain checks provide signals but cannot guarantee that a particular mailbox exists or will accept email.
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