From the FAQ:
Can I use JMP for Automated or Business Purposes?
No, the P2P routes we use to exchange messages with the phone system must be used in the same way as any phone number you get from a regular cell carrier. That means no automations, marketing, or campaigns.
Alas, while I’m sure it’s great, I’m not sure if my particular usage, in communications with customers would necessarily be okay to do with their service.