uChecker

uChecker is for people who already have a list and want a clean result file. Drop a .txt or .csv. One job can take up to 9 million addresses at about 3200 a minute. No pre-clean step. Results are Good, Bad and Risk. Unknown never counts as valid. The full SMTP reply stays on the record. Dashboard app.uchecker.net, API api.uchecker.net/docs, Telegram @uchecker_bot, MCP https://uchecker.net/mcp. Thirteen DNS tools stay free at https://uchecker.net/tools.