Can I send emails without authenticating on the SMTP server?

Question

i am creating simple email sending application. In my application when ever i send email i have to put my email address or password as from but i don\'t want to use password

Answer 1

In general, you can, sure. In your concrete example code you are using GMail which does not allow anonymous sending.

From their references:

smtp.gmail.com (use authentication)
Use Authentication: Yes
Port for TLS/STARTTLS: 587
Port for SSL: 465

An additional comment regarding your catch clause:

In my opinion you are heavily misusing the exception idea. A better aproach would be something like:

catch(Exception x)
{
    var s = x.Message;
    if ( x.InnerException!=null )
    {
        s += Environment.NewLine + x.InnerException.Message;
    }

    MessageBox.Show(s);
}

Answer 2

Can i send Email without using password using c#/.net application ?

Yes, if you have access to an email gateway that doesn't require authentication you can simply do:

SmtpClient mailClient = new SmtpClient("your.emailgateway.com");
mailClient.Send(message);

Maybe your company or ISP can provide one for you?