Braintree payments can send emails on behalf of the website.
https://www.braintreepayments.com/
Email Hosting Providers · Transactional Email
Get access to data on 9,158 websites that are Braintree Mail Customers. We know of 5,242 live websites using Braintree Mail and an additional 3,916 sites that used Braintree Mail historically and 3,531 websites in the United States.
Get a list of 9,158 websites using Braintree Mail which includes location information, hosting data, contact details, 5,242 currently live websites and an additional 31,169 domains that redirect to sites in this list. 3,916 sites that used this technology previouslyand 3,531 websites in the United States currently using Braintree Mail.
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