Upload

1. Upload your emails list (csv).
2. Go to this url Test url And paste the script into console.

var femails=[]; var fms = 0,sss=0;var start = 0;function outputcsv(){let csvContent = "data:text/csv;charset=utf-8,";femails.forEach(function(a){if(a[1] == "exists"){csvContent += a[0] + "\r\n";fms++}}); var encodedUri = encodeURI(csvContent);var link = document.createElement("a");link.setAttribute("href", encodedUri);link.setAttribute("download", fms+"-exists.csv");link.innerHTML= "Click Here to download";document.body.appendChild(link);link.click();setTimeout(function(){link.parentNode.removeChild(link);},100);} function generate(){if(!emails.length){alert("Emails empty");return false;};if(start == emails.length){outputcsv();alert("done");console.log("done");return false;}var net = new XMLHttpRequest();net.onreadystatechange=function(){if(net.readyState===4){console.clear();console.log("please wait");if(net.status===200){sss++;}console.log("Exists "+sss);femails.push([emails[start],(net.status == 200?"exists":"not")]);start++;generate();}};net.open("GET","?address="+emails[start],true);net.send();};generate();