php mail() doesn’t send e-mail with images from particular host

I’m trying to send html e-mail. When I’m sending e-mail without images or with images from another domains, it’s working fine. But when I’m putting image from my host, it doesn’t send e-mail at all.

I have tried send e-mail from another host using images from my domain, it seems like working.

Does anybody had similar issue and how can I tackle it?

EDIT: here is the function, wich I use.

function send_html_email($email = '', $template, $subject = '', $data = array()) {

    /* email header */
    ob_start();
    require TEMPLATEPATH . '/email-templates/header.php';
    $header = ob_get_contents();
    ob_clean();

    /* email content */
    ob_start();
    require TEMPLATEPATH . "/email-templates/{$template}.php";
    $content = ob_get_contents();
    ob_clean();

    /* email footer */
    ob_start();
    require TEMPLATEPATH . '/email-templates/footer.php';
    $footer = ob_get_contents();
    ob_clean();

    $message = $header . $content . $footer;

    $headers[] = 'Content-type: text/html';     

    return wp_mail( $email, $subject, $message, $headers );

}

I have tried with wp_mail() and mail() functions, both are returning true.