I'm helping a client who is hosted here at GoDaddy. They have cPanel hosted email, web hosting and DNS management all here. They've been reporting that a lot of their emails aren't going through to recipients, so I signed up to MX Toolbox to monitor delivery. I've seen a lot about DKIM and SPF going around the forums, and that GoDaddy doesn't have specific support for this, but is there any other solution? Or should I advise my client to move their email somewhere else?