uChecker
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uChecker checks email lists in bulk. Upload a .txt or .csv with up to 9 million addresses in one job. Dead domains drop out automatically and are not billed. Speed is about 3200 addresses a minute. Results come back as Good, Bad and Risk, as an archive or as JSON. The mail server's full response is stored for each address, so a deleted mailbox, a frozen account and a mailbox over quota stay different answers. Addresses that cannot be checked go to Unknown and are never counted as valid. Use the dashboard at app.uchecker.net, the REST API at api.uchecker.net/docs, or the Telegram bot. There is an MCP endpoint for agents. 100 free validations to try. 13 free email DNS tools with no account at https://uchecker.net/tools. The platform has processed 1,444,486,294 addresses, of which 193,095,406 were unique.
uChecker checks email lists in bulk. Upload a .txt or .csv with up to 9 million addresses in one job. Dead domains drop out automatically and are not billed. Speed is about 3200 addresses a minute. Results come back as Good, Bad and Risk, as an archive or as JSON. The mail server's full response is stored for each address, so a deleted mailbox, a frozen account and a mailbox over quota stay different answers. Addresses that cannot be checked go to Unknown and are never counted as valid. Use the dashboard at app.uchecker.net, the REST API at api.uchecker.net/docs, or the Telegram bot. There is an MCP endpoint for agents. 100 free validations to try. 13 free email DNS tools with no account at https://uchecker.net/tools.
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About
What is uChecker?
uChecker is a technology vendor specializing in online verification and validation services. The company offers tools designed to help users assess the authenticity of various types of data, including email addresses, phone numbers, and domain names. Their solutions aim to enhance data quality and improve user engagement by ensuring that the information collected is accurate and reliable. uChecker's services are utilized by businesses seeking to streamline their operations and minimize risks associated with invalid or fraudulent data.