If you are not receiving any of the automated emails with invoices/receipts from the Career Center, it is most likely due to a Spam Filter in place not allowing those to come in.
Automated emails for billing would pertain to Invoices/Receipts. With custom email domains we find that those automated emails containing links and attachments get blocked prior to ever landing in your inbox. This can easily be resolved through a conversation with those that over see your email service.
Please confirm with your Email Provider that the following two email domains are WHITELISTED for all incoming emails:
While this will not recover any failed emails, you will start receiving all future emails related to the Career Center.