Moved WP site to a new domain, email from still shows old domain in "from"

I had a website at https://www.einsteinsurance.com and recently mvoed it over to https://www.insurancelibrary.com. I am using a contact form plugin for users to send emails. When I send a test message from the site, it still shows ‘Einsteinsurance.com’ as the sender. I looked all over in my WP settings and can’t find where this is controlled. Any ideas where this is updated?