Hi @aaronthomas28. Thanks for posting. Troubleshooting email delivery issues can be tricky. I'd suggest providing more information about what's occurring, like where the emails are getting sent from, what is generating the emails, addresses used in sending, and whether or not you're seeing a rejection notice. On the last point, typically if no rejection notice is being generated, it's because the recipient's email provider isn't doing so. If that's the case, then you may need to contact that provider (or request that your client does) so you can find out why the messages aren't coming through.