TLDR
The following is an excerpt from my book Build A SaaS App in Rails 6. The book is used in a new product I am building Mail Buffer. This article is based on an excerpt of this book's first chapter. This section covers sending and receiving mail from an application. We will use Sendgrid's email routing service and ngrok, an HTTP tunneling service. We need to create and store a password for the incoming mail and use a new feature called 'Rails Credentials'via the TL;DR App
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