我一直在浏览以下一段 Azure 函数中的 SendGrid 邮件程序代码，

[FunctionName("SendEmail")]
public static async void Run(
[ServiceBusTrigger("myqueue", Connection = "ServiceBusConnection")] Message 
email,
[SendGrid(ApiKey = "CustomSendGridKeyAppSettingName")] 
IAsyncCollector<SendGridMessage> messageCollector)
{
var emailObject = JsonConvert.DeserializeObject<OutgoingEmail> 
 (Encoding.UTF8.GetString(email.Body));

var message = new SendGridMessage();
message.AddTo(emailObject.To);
message.AddContent("text/html", emailObject.Body);
 message.SetFrom(new EmailAddress(emailObject.From));
 message.SetSubject(emailObject.Subject);

 await messageCollector.AddAsync(message);
}

public class OutgoingEmail
{
public string To { get; set; }
public string From { get; set; }
public string Subject { get; set; }
public string Body { get; set; }
}

如果我的理解是正确的，这将向消息队列“myqueue”发送一条消息，但我感到困惑的是，我需要将自定义侦听器写入队列“myqueue”以从队列中获取消息并编写逻辑来调用“client。SendEmailAsync“发送邮件或SendGrid bindng背后有一些魔力来自动取件邮件并触发邮件？