c# - Send SMTP email using System.Net.Mail via Exchange Online (Office 365)

Question

We are testing the new Office 365 beta, and i have a mail account on the Exchange Online service. Now I'm trying to connect a LOB application that can send smtp emails from my test account.

However the Exchange 365 platform requires TLS encryption on port 587, and there is a 'feature' of System.Net.Mail that does not permit Implicit SSL encryption.

Has anyone managed to get C# sending mails via this platform?

I have the following basic code that should send the mail - any advice would be appreciated.

SmtpClient server = new SmtpClient("ServerAddress");
server.Port = 587;
server.EnableSsl = true;
server.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
server.Timeout = 5000;
server.UseDefaultCredentials = false;

MailMessage mail = new MailMessage();
mail.From = new MailAddress("recipent@anyaddress");
mail.To.Add("[email protected]");
mail.Subject = "test out message sending";
mail.Body = "this is my message body";
mail.IsBodyHtml = true;

server.Send(mail);

Answer 1

Fixed a few typos in the working code above:

MailMessage msg = new MailMessage();
msg.To.Add(new MailAddress("[email protected]", "SomeOne"));
msg.From = new MailAddress("[email protected]", "You");
msg.Subject = "This is a Test Mail";
msg.Body = "This is a test message using Exchange OnLine";
msg.IsBodyHtml = true;

SmtpClient client = new SmtpClient();
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential("your user name", "your password");
client.Port = 587; // You can use Port 25 if 587 is blocked (mine is!)
client.Host = "smtp.office365.com";
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = true;
try
{
    client.Send(msg);
    lblText.Text = "Message Sent Succesfully";
}
catch (Exception ex)
{
    lblText.Text = ex.ToString();
}

I have two web applications using the above code and both work fine without any trouble.