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Technical Article => Web =>  ASP.NET

Send Email Using Gmail in ASP.NET

  amiT jaiN      2011-11-15 13:01:02      9,811    0    0

If you want to send email using your Gmail account or using Gmail's smtp server in ASP.NET application or if you don't have a working smtp server to send mails using your ASP.NET application or aspx page than sending e-mail using Gmail is best option.

you need to write code like this 

First of all add below mentioned namespace in code behind of aspx page from which you want to send the mail.
using System.Net.Mail;

Now write this code in click event of button 

C# code 

protected void Button1_Click(object sender, EventArgs e)
{
  MailMessage mail = new MailMessage();
  mail.To.Add("jainamit.agra@gmail.com");
  mail.To.Add("amit_jain_online@yahoo.com");
  mail.From = new MailAddress("jainamit.agra@gmail.com");
  mail.Subject = "Email using Gmail";

  string Body = "Hi, this mail is to test sending mail"+ 
                "using Gmail in ASP.NET";
  mail.Body = Body;

  mail.IsBodyHtml = true;
  SmtpClient smtp = new SmtpClient();
  smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
  smtp.Credentials = new System.Net.NetworkCredential
       ("YourUserName@gmail.com","YourGmailPassword");
//Or your Smtp Email ID and Password
  smtp.EnableSsl = true;
  smtp.Send(mail);
}

VB.NET code 

Imports System.Net.Mail
 
Protected  Sub Button1_Click
(ByVal sender As Object, ByVal e As EventArgs)
  Dim mail As MailMessage =  New MailMessage() 
  mail.To.Add("jainamit.agra@gmail.com")
  mail.To.Add("amit_jain_online@yahoo.com")
  mail.From = New MailAddress("jainamit.agra@gmail.com")
  mail.Subject = "Email using Gmail"
 
  String Body = "Hi, this mail is to test sending mail"+ 
                "using Gmail in ASP.NET"
  mail.Body = Body
 
  mail.IsBodyHtml = True
  Dim smtp As SmtpClient =  New SmtpClient() 
  smtp.Host = "smtp.gmail.com" //Or Your SMTP Server Address
  smtp.Credentials = New System.Net.NetworkCredential
       ("YourUserName@gmail.com","YourGmailPassword")
  smtp.EnableSsl = True
  smtp.Send(mail)
End Sub


You also need to enable POP by going to settings > Forwarding and POP in your gmail account

Change YourUserName@gmail.com to your gmail ID and YourGmailPassword to Your password for Gmail account and test the code. 

If your are getting error mentioned below 
"The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required."

than you need to check your Gmail username and password. 

If you are behind proxy Server then you need to write below mentioned code in your web.config file 
<system.net>
<defaultProxy>
<proxy proxyaddress="YourProxyIpAddress"/>
</defaultProxy>
</system.net>

If you are still having problems them try changing port number to 587 
smtp.Host = "smtp.gmail.com,587"; 

If you still having problems then try changing code as mentioned below 
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
smtp.UseDefaultCredentials = False;
smtp.Credentials = new System.Net.NetworkCredential
("YourUserName@gmail.com","YourGmailPassword");
smtp.EnableSsl = true;
smtp.Send(mail);

Hope this helps 

Source:http://csharpdotnetfreak.blogspot.com/2009/08/send-email-using-gmail-in-aspnet.html

ASP.NET EMAIL GMAIL SEND EMAIL

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