What do I need to send email in .NET?

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1.3 What do I need to send email in .NET? Printer Friendly Email This FAQ Discuss

First, and foremost, you need the .NET Framework installed. Then you need a reference to the System.Web.dll (automatically included in ASP.NET applications). Then you need to use the System.Web.Mail namespace to create and send email messages.

Because SWM is simply a wrapper around the two COM libraries: CDONTS.NewMail (found in the cdonts.dll) and CDO.Message (found in the cdosys.dll) you will also need them installed on your server. If you are using NT4 or Win9x, the cdonts.dll is installed with the NT4 Option pack or with the personal webserver. The cdosys.dll is installed by default on Windows 2003 and on Windows XP. It can also be installed by installing Microsoft Office.

Once you can successfully use SWM, you will need a relay server to send email through. A relay server is a mail server, or a SMTP server/service, that can handle sending email. SWM simply sends the mail to a relay server, and the relay server is responsible for delivering it to the final destination.

Update

I got this email from Jay Harrlow, an Outlook MVP who corrected me about this item.
It begins...

CDOSYS.DLL is part of the OS and is only installed from the OS installs. Office (Outlook actually) can optionally install CDO.DLL which System.Web.Mail does not use.

For information on the various flavors of CDO see:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/exchanchor/htms/msexchsvr_cdo_top.asp

The four CDOs are (in chronological order):

- CDO.DLL : CDO version 1.2.1
- CDONTS.DLL : CDO version 1.2.1 for Windows NT Server (not the same as CDO version 1.2.1!)
- CDOSYS.DLL : CDO for Windows 2000
- CDOEX.DLL : CDO for Exchange 2000 Server

FWIW: CDOEX.DLL is installed as part of Exchange Server installs.
Jay

Discuss This FAQ Item
Got a question? Another Suggestion? Want to post your solution? Discuss it below.

What do I need to send email int .net [ Reply ]
Can I send email in .net with any product of .NET (Architect, Developer or Professional)?

Can I gain access to any class of .NET FRAMEWORK with any product of .NET (Architect, Developer or Professional)?

Thank you.

Luis Enrique Gracia Prieto [ legracia ( at ) coferdroza dot es ], 2004-03-15 04:33:24 #
- RE: What do I need to send email int .net [ Reply ]
  Yes.
  
  dave [ dave ( at ) 123aspx dot com ], 2004-03-15 04:48:49 #
  - RE RE: What do I need to send email int .net [ Reply ]
    When i tired to send a mail in Asp.net
    an error ocoured
    
    remya [ remyaelizabeth ( at ) yahoo dot co dot in ], 2005-01-26 00:30:24 #
- RE: What do I need to send email int .net [ Reply ]
  hello
  
  murali [ mreddy ( at ) yahoo dot co dot in ], 2006-01-26 00:24:00 #
- RE: What do I need to send email int .net [ Reply ]
  i need code in vb6 to send email to yahoo mails such as my email
  please help me
  
  hatem [ toma99tom99 ( at ) yahoo dot com ], 2006-06-07 08:15:52 #
- RE: What do I need to send email int .net [ Reply ]
  my System.Web.dll has no .Mail
  what wrong please ?
  
  john [ john dot holme ( at ) rabobank dot com ], 2006-06-27 08:10:08 #
  - RE RE: What do I need to send email int .net [ Reply ]
    I got the problem. I downloaded a new system.web.dll from this site :
    
    http://www.dll-downloads.com/hosts.asp?System.Web.dll
    
    After adding a reference to this .dll, the .mail class was avilable ;-)
    
    Phil [ philippesimoes ( at ) excite dot com ], 2006-07-14 16:28:34 #
- RE: What do I need to send email int .net [ Reply ]
  I need to send a mail in.net
  
  yannam [ yapparao ( at ) gmail dot com ], 2006-08-03 00:44:07 #
Relaying [ Reply ]
How do I set up relaying?

Mathieu Diepman [ mathieu dot diepman ( at ) getronics dot com ], 2004-04-05 02:51:01 #
- RE: Relaying [ Reply ]
  You can configure SMTP services and relay setting in your Default SMTP Virtual Server (found at IIS)
  
  Default SMTP Virtual Server > Properties>General
  Here you can set your SMTP server address
  
  Properties > Access
  Here you can add relay server address
  
  For local machine the address is 127.0.0.1
  
  Hope this helps,cheers
  
  Cijo Ceazer [ cijo_ceazer ( at ) yahoo dot co dot in ], 2005-02-20 00:37:46 #
- RE: Relaying [ Reply ]
  SEND ME A MESSAGE BACK.
  
  PAUL FARRELL [ FARRELL dot PAUL ( at ) VIRGIN dot NET ], 2005-08-24 12:52:21 #
How to make command_bottom in VB.NET send Outlook Express email [ Reply ]
I have problem...

In my VB.Net form1,
INSIDE only have one TextBox1 for store email address & one Bottom1 for use transfer the “TextBox1” contents & create the new email in outlook express

Can someone tell me the sources how to make the bottom active for the above function.

Spencer
mydream@pacific.net.hk

Spencer [ mydream ( at ) pacific dot net dot hk ], 2004-07-13 22:46:41 #
Code or CDOSYS.DLL Load [ Reply ]

I am attempting to send mail using an external mail server. I have read plenty about the “.fields.add” addition to the SMTPmail class . I am using the code below and get an error in Visual Studio that “fields” is not a member of System.Web.Mail.MailMessage class.

I thought that perhaps the issue is that I do not have CDOsys.dll registered on my computer. When attempting to do so (register CDOsys.dll) I get a failure to register from RegSvr32.EXE application.

Do you believe that this is the problem or do you see any other issues in my code? I’m at a loss.

Imports System
Imports System.Collections
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Security.Cryptography
Imports System.Text
Imports System.Text.RegularExpressions
Imports System.Web.Mail
Imports System.Web.Mail.SmtpMail
Imports System.Web
Imports System.Net

.
.
.

Public Function

SendMail(ByVal [From] As String, ByVal [To] As String, _
ByVal [Cc] As String, ByVal [Bcc] As String, ByVal [Priority] As Mail.MailPriority, _
ByVal [Subject] As String, ByVal [BodyFormat] As Mail.MailFormat, _
ByVal [BodyEncoding] As System.Text.Encoding, ByVal [Body] As String, _
ByVal [Attachment] As String) As String

Dim mail As New MailMessage()

mail.From = [From]
mail.To = [To]
mail.Priority = [Priority]
mail.Subject = [Subject]
mail.BodyFormat = [BodyFormat]
mail.BodyEncoding = [BodyEncoding]
mail.Body = [Body]

' external SMTP serve
If SMTPServer <> "" Then
SmtpMail.SmtpServer = SMTPServer
Mail.Fields.add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";) = 1
mail.Fields.add("http://schemas.microsoft.com/cdo/configuration/sendusername";) = SMTPUserName
mail.Fields.add("http://schemas.microsoft.com/cdo/configuration/sendpassword";) = SMTPPassword

End If

Try
SmtpMail.Send(mail)
Catch objException As Exception
LogError(objException)
End Try

End Function

warren [ wsmay ( at ) newlineservices dot com ], 2005-03-01 14:58:49 #
- RE: Code or CDOSYS.DLL Load [ Reply ]
  You are referencing the 1.0 .NET Framework. The .Fields property was introduced in the 1.1 Framework.
  
  Cheers!
  Dave
  
  dave wanta [ dave ( at ) 123aspx dot com ], 2005-03-01 15:01:23 #
  - RE RE: Code or CDOSYS.DLL Load [ Reply ]
    Thanks. I believe that I have downloaded/installed Framework 1.1 but maybe I havent. How & where do I look to determine that 1.1 is installed?
    
    Warren
    
    warren [ wsmay ( at ) newlineservices dot com ], 2005-03-03 05:33:27 #
    - RE: RE RE: Code or CDOSYS.DLL Load [ Reply ]
      C:\WINNT\Microsoft.NET\Framework
      
      or
      
      C:\Windows\Microsoft.NET\Framework
      
      You can see all of the versions of .Net framework you have installed. It will have a seperate folder for each version.
      
      Greg Conely [ gjconely ( at ) imagementor dot net ], 2005-05-27 11:57:21 #
Problems sending email [ Reply ]
I'm writing a program to send an email internally. Here is the code I've got:

Dim Smtp As SmtpMail
Smtp.SmtpServer = "mail.co.navajo.az.us"
Dim Msg As MailMessage = New MailMessage
Msg.To = "james.williams@co.navajo.az.us"
Msg.From = "james.williams@co.navajo.az.us"
Msg.Body = "This is a test email."
Msg.Subject = "New Record(s)"
Smtp.Send(Msg)

I'm getting an exception thrown at the Smtp.Send(Msg) line and can't figure out exactly why.
Here's the exception message that I get:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll
Additional information: Exception has been thrown by the target of an invocation.

According to my network guru guy, "mail.co.navajo.az.us" should resolve to our mail server. Is there something I'm missing? I got this code directly from a book example.

Since I'm sending the email internally, is there anything different I must do? Our mail server is a MS Exchange mail server. Thanks for any help.

Jim Williams [ james dot williams ( at ) co dot navajo dot az dot us ], 2005-03-15 12:35:17 #
- RE: Problems sending email [ Reply ]
  Here are the details of the error message I get. It seems to point to a problem with a library:
  
  See the end of this message for details on invoking
  just-in-time (JIT) debugging instead of this dialog box.
  
  ************** Exception Text **************
  System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80029C4A): Error loading type library/DLL.
  --- End of inner exception stack trace ---
  at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters)
  at System.RuntimeType.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParameters)
  at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
  at System.Web.Mail.SmtpMail.Send(MailMessage message)
  at EmailTest.Form1.Button1_Click(Object sender, EventArgs e) in C:\Documents and Settings\james.williams\My Documents\Visual Studio Projects\EmailTest\Form1.vb:line 69
  at System.Windows.Forms.Control.OnClick(EventArgs e)
  at System.Windows.Forms.Button.OnClick(EventArgs e)
  at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
  at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
  at System.Windows.Forms.Control.WndProc(Message& m)
  at System.Windows.Forms.ButtonBase.WndProc(Message& m)
  at System.Windows.Forms.Button.WndProc(Message& m)
  at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
  at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
  at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  
  ************** Loaded Assemblies **************
  mscorlib
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2032
  CodeBase: file:///c:/windows/microsoft.net/framework/v1.1.4322/mscorlib.dll
  ----------------------------------------
  EmailTest
  Assembly Version: 1.0.1900.18598
  Win32 Version: 1.0.1900.18598
  CodeBase: file:///C:/Documents%20and%20Settings/james.williams/My%20Documents/Visual%20Studio%20Projects/EmailTest/bin/EmailTest.exe
  ----------------------------------------
  System.Windows.Forms
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2032
  CodeBase: file:///c:/windows/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll
  ----------------------------------------
  System
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2032
  CodeBase: file:///c:/windows/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll
  ----------------------------------------
  System.Drawing
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2032
  CodeBase: file:///c:/windows/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll
  ----------------------------------------
  System.Xml
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2032
  CodeBase: file:///c:/windows/assembly/gac/system.xml/1.0.5000.0__b77a5c561934e089/system.xml.dll
  ----------------------------------------
  System.Web
  Assembly Version: 1.0.5000.0
  Win32 Version: 1.1.4322.2037
  CodeBase: file:///c:/windows/assembly/gac/system.web/1.0.5000.0__b03f5f7f11d50a3a/system.web.dll
  ----------------------------------------
  
  ************** JIT Debugging **************
  To enable just in time (JIT) debugging, the config file for this
  application or machine (machine.config) must have the
  jitDebugging value set in the system.windows.forms section.
  The application must also be compiled with debugging
  enabled.
  
  For example:
  
  <configuration>
  <system.windows.forms jitDebugging="true" />
  </configuration>
  
  When JIT debugging is enabled, any unhandled exception
  will be sent to the JIT debugger registered on the machine
  rather than being handled by this dialog.
  
  Jim Williams [ james dot williams ( at ) co dot navajo dot az dot us ], 2005-03-15 13:24:45 #
- RE: Problems sending email [ Reply ]
  The following:
  -----------------------------------------------------------
  Dim Smtp As SmtpMail
  Smtp.SmtpServer = "mail.co.navajo.az.us"
  Dim Msg As MailMessage = New MailMessage
  Msg.To = "james.williams@co.navajo.az.us"
  Msg.From = "james.williams@co.navajo.az.us"
  Msg.Body = "This is a test email."
  Msg.Subject = "New Record(s)"
  Smtp.Send(Msg)
  -----------------------------------------------------------