从默认电子邮件地址而不是我指定的电子邮件地址发送的php邮件

如何解决从默认电子邮件地址而不是我指定的电子邮件地址发送的php邮件

我有一个将数据发送到以下脚本的表单。它应该从表单的电子邮件地址中指定的人发送消息。相反，我是从托管公司的一个奇怪的电子邮件地址获得的。我已经一遍又一遍地检查了PHP，无法找到问题所在。电子邮件确实发送...只是从错误的地址发送的邮件...

<?
// set recipient email
$mymail = "[e-mail]";

// get information from form
$name = $_POST['firstname'] . " - " . $_POST['lastinitial'];
$email = $_POST['emailaddress'];
$multiplemail = $mymail . "," . $email;
$message = $_POST['testimonial'];
$message = wordwrap($message,200,"\r\n");
$subject = "Testimonial Submission:  ";
date_default_timezone_set('US/Eastern');
$body = "Date:  " . date('m-d-Y') . " - Time:  " . date('h:i:s A e') . "\n Name:  " . $name . "\n eMail:  <" . $email . "> \n wrote:  \n" . $message;
$headers = "To:" . $email . "," . $mymail . ",From:" . $email;

// check the eMail!
$emailB = filter_var($email,FILTER_SANITIZE_EMAIL);
if (filter_var($emailB,FILTER_VALIDATE_EMAIL) === false || $emailB != $email)
    {

// display error message!
        echo "This eMail adress that you entered in the form is invalid!  Please go back and enter a correct eMail address!";

// Exit the checking scriptlet!
        exit(0);
    }
else
    {
        if(!mail($multiplemail,$subject,$body,$headers))
            {
// Testimonial was NOT sent
                die ("Testimonial Could not be sent!  Please try again later!");
            }
        else
            {
// Testimonial was successfully sent
                ?><Meta http-equiv="refresh" content="0; URL=thankyou.html"><?
            }
    }

？>

您能给我的任何帮助将不胜感激。预先感谢。