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Email facility is required for almost every application. Hence these tips are helpful.

1. For datetime in proper format,

$headers["Date"] = date("r");

2. For both HTML and text mail,

 $headers["Content-Type"] = "multipart/alternative";

3. For sending mail with SMTP Authentication,

$mail = Mail::factory(
                "smtp",
                array ('host' => $host,
                'auth' => 'true',
                'username' => $username,
                'password' => $password)
                );

A quick helpful tutorial: http://email.about.com/od/emailprogrammingtips/qt/et073006.htm