https://angularfirebase.com/lessons/angular4-transactional-email-with-cloud-functions-and-sendgrid/
In this episode, I am going to show you how send transactional email in Angular as a background task in cloud. To facilitate this, the emails will be send with Google Cloud Functions for Firebase and the email service Sendgrid. You can use any email provider you want such as mailgun or postmark or even Gmail, but I will chose Sendgrid for this tutorial because they have a solid helper library and a detailed
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