(JavaScript) Verify Email Recipients

A way to possibly determine valid/invalid email addresses. I would recommend being very careful about doing this because your IP address may be flagged as a potential spammer by the mail server (because you are probing for valid/invalid email addresses). This Chilkat functionality existed for many years, before this kind of activity became a problem. The functionality remains only because it is useful for some to test with their own SMTP servers.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var mailman = new CkMailMan();

// SMTP connection settings...
mailman.SmtpHost = "smtp.example.com";
mailman.SmtpUsername = "MY_SMTP_USERNAME";
mailman.SmtpPassword = "MY_SMTP_PASSWORD";
mailman.SmtpSsl = true;
mailman.SmtpPort = 465;

// Create a new email object
var email = new CkEmail();

email.Subject = "This is a test";
email.Body = "This is a test";
email.From = "myemail@example.com";
success = email.AddTo("person1","person1@example.com");
success = email.AddTo("person2","person2@example.com");
success = email.AddTo("person3","person3@example.com");
// The SMTP server smtp.example.com won't know anything about an email address @somewhere_else.com
success = email.AddTo("person3","person4@somewhere_else.com");
// ...

// Verify recipients.
// **** See the warning about using this API method in the description above.
// (An SMTP server only knows valid email address for its own domain.  For example,
// smtp.example.com *may* only know if person1@example.com is valid or invalid, but does
// not know anything about the validity of email addresses having other domains.)
var badAddrs = new CkStringArray();
success = mailman.VerifyRecips(email,badAddrs);
if (success !== true) {
    console.log(mailman.LastErrorText);
    return;
}

var i = 0;
while (i < badAddrs.Count) {
    console.log(badAddrs.GetString(i));
    i = i+1;
}

console.log("done.");