Access Attached Message (Embedded Email)

How to access an email embedded within another email (i.e. an attached message).

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<?php

$email = new COM("Chilkat.Email2");

//  Load an email from a .eml

$success = $email->LoadEml('embeddedEmail.eml');
if ($success != true) {
    print $email->lastErrorText() . "\n";
    exit;
}

//  Display how many attached emails are embedded within
//  this one:

$numAttached = $email->NumAttachedMessages;
print $numAttached . "\n";

//  Get the 1st attached message.

$email2 = $email->GetAttachedMessage(0);
if (!(is_null($email2))) {

    //  Display the subject, From, and a header field...
    print $email2->subject() . "\n";
    print $email2->from() . "\n";
    print $email2->getHeaderField('X-SOMETHING') . "\n";
}

?>