Sending email using ASP.NET I am getting this error

Question

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. u6sm344516ibd.6

I have my code like this?

MailAddress to = new MailAddress("xxxxx@gmail.com");
MailAddress from = new MailAddress("xxx@gmail.com");
MailMessage message = new MailMessage(from, to);
message.Subject = "Error Occred in the application:";
message.Body = ex.Message;
SmtpClient client = new SmtpClient("smtp.gmail.com", 587);

Answer 1

the SMTP server required that you use a secure connection

client.EnableSsl = true;

Answer 2

You could check if setting the EnableSsl property for SmtpClient to true and specifying the credentials would help.

client.EnableSsl = true;
client.Credentials = new NetworkCredential("user", "password");

Answer 3

You will need to set the appropriate properties of the SmtpClient instance to enable TSL/SSL, and set credentials. Check out this for more:

http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.aspx

Answer 4

Try configuring your SMTP to use port 25 (with SSL).