Be that as it may, but transactional letters are very important for successful business, because they allow your customers to be informed in time about what stage of processing their order is at, about where their email was registered, congratulations with birthdays or holidays of your regular customers are also a significant contribution to your good reputation and a more transparent brand-customer relationship. I find this email service https://mailazy.com/ to be one of the best for creating, configuring and sending such newsletters. I'm not worried that an error might occur here and a new client will not receive an email to confirm his registration and probably will not place an order on my website.