是否可以从SendGrid和React.js发送电子邮件而没有后端？

Question

我有一个React.js应用程序，我正在cPanel上托管该应用程序，该应用程序不允许后端。想知道我是否可以让sendgrid在没有后端的情况下工作？有人有没有以前工作过？

我目前收到以下错误：

Access to fetch at 'https://api.sendgrid.com/v3/mail/send' from origin ' 
    https://angelospizzaharvard.com' has been blocked by CORS policy: Response 
    to preflight request doesn't pass access control check: The 'Access-Control- 
    Allow-Origin' header has a value 'https://sendgrid.api-docs.io' that is not 
    equal to the supplied origin. 


Have the server send the header with a valid 
    value, or, if an opaque response serves your needs, set the request's mode 
    to 'no-cors' to fetch the resource with CORS disabled.
    Navbar.js:427 TypeError: Failed to fetch

Answer 1

从此链接sendgrid docs，似乎只能从后端服务器调用它。