These IP addresses are unique to LawToolBox and are not part of any pooled IP marketing group where other organizations can send using these IP addresses (pooled IP’s can allow someone else to send under the same IP and harm your email reputation).
To increase the probability of our emails making it to clients with this new email methodology, we have also implement the following reverse DNS lookup recommended by SendGrid:
https://sendgrid.com/docs/ui/account-and-settings/how-to-set-up-reverse-dns/
When we follow this reverse DNS procedure it results in the following records being generated: