问SendGrid Api键仅限于沙箱测试电子邮件

EN

public async Task SendEmail(
    string fromEmail, 
    string fromName,
    string toEmail, 
    string subject,
    string plainTextContent,
    string htmlContent)
{
    var apiKey = "ThisIsTheApiKeyWithRestrictedPermissionsGeneratedAtMySendGridDashboard"
    var client = new SendGridClient(apiKey);
    var sandboxMode =
        new SandboxMode
        {
            Enable = true
        };

    var mailSettings =
        new MailSettings
        {
            SandboxMode = sandboxMode
        };
    var from = new EmailAddress(fromEmail, fromName);
    var to = new EmailAddress(toEmail);
    var message = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
    message.MailSettings = mailSettings;
    var result = await client.SendEmailAsync(message);
}