SendGrid Tutorial resulting in Bad Request

Question

I apologize if this is a dupe question, but I have not found any solid information about this issue either on this site or on others.

With that being said, I am working on an MVC 5 web application. I am following this tutorial over on ASP.net.

public async Task SendAsync(IdentityMessage message)
{
    await configSendGridasync(message);
}

private async Task configSendGridasync(IdentityMessage message)
{
    var myMessage = new SendGridMessage();
    myMessage.AddTo(message.Destination);
    myMessage.From = new System.Net.Mail.MailAddress(
                        "[email protected]", "Your Contractor Connection");
    myMessage.Subject = message.Subject;
    myMessage.Text = message.Body;
    myMessage.Html = message.Body;

    var credentials = new NetworkCredential(
         Properties.Resources.SendGridUser,
         Properties.Resources.SendGridPassword,
         Properties.Resources.SendGridURL // necessary?
         );

    // Create a Web transport for sending email.
    var transportWeb = new Web(credentials);

    // Send the email.
    if (transportWeb != null)
    {
        await transportWeb.DeliverAsync(myMessage);
    }
    else
    {
        Trace.TraceError("Failed to create Web transport.");
        await Task.FromResult(0);
    }
}

Each time it gets to the await transportWeb.SendAsync(myMessage) line in the above method, this error shows up in the browser:

---

Server Error in '/' Application.

Bad Request

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Exception: Bad Request

Line 54:             if (transportWeb != null)
Line 55:             {
Line 56:                 await transportWeb.DeliverAsync(myMessage);
Line 57:             }
Line 58:             else
Line 59:             {
Line 60:                 Trace.TraceError("Failed to create Web transport.");
Line 61:                 await Task.FromResult(0);
Line 62:             }

---

I signed up for a free account over at https://sendgrid.com/, using the "Free Package Google", giving me 25,000 monthly credits. The account has been provisioned.

I have tried a bunch of things so far including: disabling SSL, putting username/password directly in the code instead of pulling them from the Resources.resx file, specifying the SMTP server inside the NetworkCredential object, and also tried changing DeliverAsync(...) to Deliver().

I tried explicitly setting the subject instead of using message.Subject, as this post suggested. I also tried HttpUtility.UrlEncode on the callbackUrl generated in the Account/Register method as suggested here. Same results, unfortunately.

Does anyone happen to have some insight as to what might be causing this to not function correctly?

Answer 1

I ended up using the built-in SmtpClient to get this working. Here is the code that I am using:

private async Task configSendGridasync(IdentityMessage message)
{
    var smtp = new SmtpClient(Properties.Resources.SendGridURL,587);

    var creds = new NetworkCredential(Properties.Resources.SendGridUser, Properties.Resources.SendGridPassword);

    smtp.UseDefaultCredentials = false;
    smtp.Credentials = creds;
    smtp.EnableSsl = false;

    var to = new MailAddress(message.Destination);
    var from = new MailAddress("[email protected]", "Your Contractor Connection");

    var msg = new MailMessage();

    msg.To.Add(to);
    msg.From = from;
    msg.IsBodyHtml = true;
    msg.Subject = message.Subject;
    msg.Body = message.Body;

    await smtp.SendMailAsync(msg);
}

Even though it doesn't use SendGrid's C# API, the messages still show up on my SendGrid dashboard.