SMTP Exception when trying to send mail in C#

Question

I am using the following very simple code and I keep getting System.Net.Mail.SmtpException failure sending mail. This is my code:

static void main(string[] args)
{
    MailAddress from = new MailAddress("[email protected]", "Mr. Test");
    MailAddress to = new MailAddress("[email protected]", "mr. man");
    MailMessage msg = new MailMessage(from, to);
    msg.Subject = "email";
    msg.Body = "This is email.";
    SmtpClient client = new SmtpClient("smtp.gmail.com");

    client.Send(msg);
}

I have never tried programmatically sending email before so I appreciate the help.

Can you get a full error stack with the message? Try exception.ToString() — bryanmac
– bryanmac, Commented Sep 7, 2011 at 19:06
I would assume it's because you aren't authenticating with gmail. — George Johnston
– George Johnston, Commented Sep 7, 2011 at 19:07

Community · Accepted Answer · 2017-05-23 11:47:57Z

5

You're missing credentials and sending as TLS (secured connection):

Credentials = new NetworkCredential("[email protected]", "mypwd"), 
EnableSsl = true

More Details here: Sending email through Gmail SMTP server with C#

edited May 23, 2017 at 11:47

CommunityBot

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answered Sep 7, 2011 at 19:12

bryanmac

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Comments

Kevin Kalitowski · Accepted Answer · 2011-09-07 19:10:41Z

2

First thing I see incorrect with the code given is there is no username/password given for validation with the smtp server.

Also, to get a better idea of what exactly is causing the SmtpException, catch the exception in your debugger and look at the details of the exception. I've gotten good explanations of what is causing SMTP errors by doing this.

You can try following these directions to send mail using SMTP via gmail. http://blogs.msdn.com/b/mariya/archive/2006/06/15/633007.aspx

answered Sep 7, 2011 at 19:10

Kevin Kalitowski

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Comments

Leons · Accepted Answer · 2011-09-07 19:14:03Z

2

Google does not want you to use port 25, they want you to use 587 (ssl) or 467. They also require that you authenticate when sending mail.

answered Sep 7, 2011 at 19:14

Leons

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