Sending Email using SMTP Authentication

You need to:
1. use your email server as the smtp, this is usually mail.yourdomain.com
2. authenticate to the smtp server
3. make sure your "From" address is exactly the same as your login address in your code

PHP

C# 1.1

private void Page_Load(object sender, System.EventArgs e)
{
 MailMessage mail = new MailMessage();
 mail.To = "me@mycompany.com";
 mail.From = "you@yourcompany.com";
 mail.Subject = "this is a test email.";
 mail.Body = "Some text goes here";
 mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
 mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "my_username_here"); //set your username here
 mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "super_secret"); //set your password here

 SmtpMail.SmtpServer = "mail.mycompany.com";  //your real server goes here
 SmtpMail.Send( mail );
}

C# 2.0

static void Authenticate()
{
//create the mail message
MailMessage mail = new MailMessage();

//set the addresses
mail.From = new MailAddress("me@mycompany.com");
mail.To.Add("you@yourcompany.com");

//set the content
mail.Subject = "This is an email";
mail.Body = "this is the body content of the email.";

//send the message
SmtpClient smtp = new SmtpClient("mail.yourdomain.com");

//to authenticate we set the username and password properites on the SmtpClient
smtp.Credentials = new NetworkCredential("username@yourdomain.com", "secret");
smtp.Send(mail);

}

VB.net 1.1

Private Sub Page_Load(sender As Object, e As System.EventArgs)
   Dim mail As New MailMessage()
   mail.To = "me@mycompany.com"
   mail.From = "you@yourcompany.com"
   mail.Subject = "this is a test email."
   mail.Body = "Some text goes here"
   mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1") 'basic authentication
   mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "my_username_here") 'set your username here
   mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "super_secret") 'set your password here
   SmtpMail.SmtpServer = "mail.mycompany.com" 'your real server goes here
   SmtpMail.Send(mail)
End Sub 'Page_Load

VB.net 2.0

<%@ Import Namespace="System.Net.Mail" %>

Sub Authenticate()
'create the mail message
Dim mail As New MailMessage()

'set the addresses
mail.From = New MailAddress("me@mycompany.com")
mail.To.Add("you@yourcompany.com")

'set the content
mail.Subject = "This is an email"
mail.Body = "this is the body content of the email."

'send the message
Dim smtp As New SmtpClient("mail.yourdomain.com")

'to authenticate we set the username and password properites on the SmtpClient
smtp.Credentials = New NetworkCredential("username@yourdomain.com", "secret")
smtp.Send(mail)
End Sub 'Authenticate

ASP

 <%
 Dim ObjSendMail
 Set ObjSendMail = Server.CreateObject("Persits.MailSender")
 
 ObjSendMail.Host = "mail.somesite.com"
 ObjSendMail.From = "someone@somesite.com"
 ObjSendMail.FromName = "someone"
 ObjSendMail.AddAddress "somebodyelse@somesite.com"
 ObjSendMail.Subject = "your subject"
 ObjSendMail.Body = "your email body"
  
Our email server requires SMTP Authentication. Replace the username and password below.
ObjSendMail.Username = "SMTPUsername"
ObjSendMail.Password = "SMTPPassword"
 
 On Error Resume Next
 
 ObjSendMail.Send
 If Err <> 0 Then
    Response.Write "Error encountered: " & Err.Description
 End If
 
 Set ObjSendMail = nothing
%> 

Perl

Coldfusion

<Cfmail server="SMTPUsername:SMTPPassword@mail.somesite.com"
             from="someone@somesite.com"
             to="somebodyelse@somesite.com"
             subject="your subject">
your email body
</CFMAIL>