Braintree payments can send emails on behalf of the website.
https://www.braintreepayments.com/
Email Hosting Providers · Transactional Email
Get access to data on 8,849 websites Braintree Mail Customers. We know of 5,148 live websites using Braintree Mail and an additional 3,701 sites that used Braintree Mail historically and 3,499 websites in the United States.
Get a list of 8,849 websites using Braintree Mail which includes location information, hosting data, contact details, 5,148 currently live websites and an additional 23,409 domains that redirect to sites in this list. 3,701 sites that used this technology previouslyand 3,499 websites in the United States currently using Braintree Mail.
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