c# - Sendgrid 不会收到来自 .NET Core 2.0 控制台应用程序的电子邮件

Question

我正处于设置 SendGrid 的“验证集成”阶段，并且正在使用下面的代码发送我的第一封电子邮件。我已经从他们的说明中复制了代码：

// using SendGrid's C# Library
// https://github.com/sendgrid/sendgrid-csharp
using SendGrid;
using SendGrid.Helpers.Mail;
using System;
using System.Threading.Tasks;
using System.Threading;

namespace Example
{
    internal class Example
    {
        private static async Task Main()
        {
            await Execute();
            Thread.Sleep(10000);
        }

        static async Task Execute()
        {
            var apiKey = "myapikey";
            var client = new SendGridClient(apiKey);
            var from = new EmailAddress("test@example.com", "Example User");
            var subject = "Sending with SendGrid is Fun";
            var to = new EmailAddress("test@example.com", "Example User");
            var plainTextContent = "and easy to do anywhere, even with C#";
            var htmlContent = "<strong>and easy to do anywhere, even with C#</strong>";
            var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);
        }
    }
}

我在一个面向 netcoreapp2.0 的控制台应用程序中运行它，来自 mac。代码运行没有错误；它说“已接受”，但我从未通过 SendGrid Web 控制台收到电子邮件。我究竟做错了什么？

编辑：PS 我是从我的本地机器上运行的，而不是从网络服务器上运行的。