Hello @RandyD203 ,
Feel free to follow this helpful article on exporting lists and contacts. Please keep in mind that if this other party is going to be emailing these contacts, they need to make sure they have permission to do so, otherwise it could result in compliance-related or legal consequences. For example, here's our policy on email permissions. I'd also recommend looking into certain legal acts like CASL, GDPR, and similar laws if you're still unsure.