I am writing a newsletter system for my client. They write the email body with CKEditor and I want to embed all images they give in the editor.

It forwards the content of the email in a variable, named content.

public function send ( $newsletter, $subscriber, $time = 0 )
{
    $template = 'emails.templates.' . $newsletter->template;

    Mail::later($time, $template,
    [
        'content' => $newsletter->content
    ],
    function ($message) use ($newsletter, $subscriber) {
        $message->subject($newsletter->subject);
        $message->from('newsletter@example.com', 'Example Newsletter');
        $message->to($subscriber->email, $subscriber->fullname);

        foreach ( $newsletter->attachments AS $attachment ) {
            $path = public_path($attachment->path); 
            $message->attach($path);
        }
    });

    return Redirect::back()->with('success', true);
}