Error while sending email using SMTP & exchange server office365.com - asp.net-mvc

Question

I am trying to send email from my controller (MVC4) through exchange server i.e. (outlook.office365.com as I can see it from my outlook settings) using SMTP but could not succeed. I tried solution from many previous posts but cant get any clue. I sincerely appreciate any help from you guys..
Here is my mail configuration:
<system.net>
<mailSettings>
<smtp>
<network host="smtp.office365.com" userName="no-reply#mydomain.com" password="defaultPassword"/>
</smtp>
</mailSettings>
</system.net>
Here is my class for email:
public class eMail
{
public eMail() { }
private string Sender{ get; set; }
private List<string> Recipients { get; set; }
private string Subject { get; set; }
private string Body { get; set; }
public bool SendEmail()
{
try
{
var smptClient = new SmtpClient { EnableSsl = true };
MailMessage newEmail = new MailMessage();
foreach (var reciepent in this.Recipients )
newEmail.To.Add(new MailAddress(recipient));
newEmail.From = new MailAddress(this.Sender);
newEmail.Subject = this.Subject;
newEmail.Body = this.Body;
newEmail.IsBodyHtml = false;
smptClient.Send(newEmail);
return true;
}
catch { return false; }
}
}
in above code if I use "EnableSsl = true", I get error "Server does not support secure connections.". Still if I disable ssl, I get following error:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM

Answer 1

use this piece of code:
MailMessage msg = new MailMessage();
msg.To.Add(new MailAddress("someone#somedomain.com", "SomeOne"));
msg.From = new MailAddress("you#yourdomain.com", "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 = 25; // give 587 if 25 is blocked
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();
}

Answer 2

Finally I'd resolve the issue which was related to domain we have.
For the person who are facing similar problem, here is how I had fixed it. Follwoing were my email settings:
<network host="smtp.office365.com" userName="no-reply#mydomain.com" password="defaultPassword"/>
If you are on domain then your username must have domain mentioned in your username i.e. no-reply#domain.mydomain.com and bang :)
Cheers!!