(PHP ActiveX) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.MailMan')
$mailman = new COM("Chilkat.MailMan");

// SMTP connection settings...
$mailman->SmtpHost = 'smtp.example.com';
$mailman->SmtpUsername = 'MY_SMTP_USERNAME';
$mailman->SmtpPassword = 'MY_SMTP_PASSWORD';
$mailman->SmtpSsl = 1;
$mailman->SmtpPort = 465;

// Create a new email object
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Email')
$email = new COM("Chilkat.Email");

$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.)
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringArray')
$badAddrs = new COM("Chilkat.StringArray");
$success = $mailman->VerifyRecips($email,$badAddrs);
if ($success != 1) {
    print $mailman->LastErrorText . "\n";
    exit;
}

$i = 0;
while ($i < $badAddrs->Count) {
    print $badAddrs->getString($i) . "\n";
    $i = $i + 1;
}

print 'done.' . "\n";

?>