Hi. I also get the 'scary' message, but the InnerException that I get is totally different. First I have the System.Web.HttpException, whose InnerException is System.Reflection.TargetInvocationException, whose InnerException is System.Runtime.InteropServices.COMException, which doesn't have an InnerException, but it has an HResult property set to -2147219963, that is an MAPI_E_NOT_INITIALIZED error thrown by the CDO.Message.1 object. Any ideas about how to work around this? I was a little confused since I wouldn't expect CDOSYS.dll to rely on MAPI. Thanks in advance and congratulations for your great site.

Rolando Matarrita Sequeira [ rmatarrita ( at ) hotmail dot com ], 2004-02-03 14:42:19 #

Hi,
Love your site. I've been hunting high and low for an answer to this. There seems to be many questions on this and very fews answers elsewhere.

Anyway I fixed my problem my looking at the InnerException message. This had a message ' 451 See http://pobox.com/~djb/docs/smtplf.html'
This site told me that there was a 'bare LF' without a 'CR', ie. a line-feed without a carriage return. In the message I was sending '\n' without a '\r', so adding a '\r' fixed the error. By the way, I ended up using an html break '<br>' which worked better for me.

Regards,
Bryan Stanton

Bryan Stanton [ stantonb ( at ) ihug dot com dot au ], 2004-02-05 15:36:08 #

Hi Dave

Thank you heaps for the website, it is a true dedication to the class..

I have a intranet aspx page that needs to send via an Exchange server an email WITH attachments.

The problem is this, the application will send attachments of any size if I terminal service onto the box and run it from internet explorer there. When I try to send attachments from ANY other machine on the intranet, if the attachment is more than 100kb in size it will throw the error below.

I know it is not exchange as I can send the email with the same attachment from the server via terminal services. I know it is not permissions as I can still send smaller attachments (under 100kb) with the same name and type from ANY other machine on the network.

The error message as you can see does not give much away as to what the problem is. I was hoping you had some experience with this at some point and may be able to point me in the right direction.

Here is the ERROR:

Error Message:
Could not access 'CDO.Message' object.

Error Source:
System.Web

Inner Exception:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80004005): Unspecified error --- 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.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)

HERE is the code I am using:

private void SendMail(XmlDocument inXML)
{
//attempt the transform
string htmlMsg = String.Empty;

XslTransform xslt = new XslTransform();
xslt.Load(@"\Inetpub\wwwroot\TEST\XSL\TESTEmail.xslt");

StringWriter sw = new StringWriter();
xslt.Transform(inXML, null, sw);
htmlMsg = sw.ToString();
sw.Close();

MailMessage msg = new MailMessage();
msg.BodyFormat = MailFormat.Html;
msg.To = ConfigurationSettings.AppSettings["EmailTo"];
msg.From = ConfigurationSettings.AppSettings["EmailFrom"];
msg.Subject = "TEST";
msg.Body = htmlMsg;

foreach (ListItem li in lbAttachments.Items)
{
MailAttachment newAtt = new MailAttachment(li.Value, System.Web.Mail.MailEncoding.Base64);
msg.Attachments.Add(newAtt);
}

SmtpMail.SmtpServer = ConfigurationSettings.AppSettings["SMTPServer"];

SmtpMail.Send( msg );

foreach (ListItem lii in lbAttachments.Items)
{
try
{
File.Delete(lii.Value);
}
catch
{}
}
}

Many thanks for any help you can give..

Ryan.

Ryan [ rowslw ( at ) hotmail dot com ], 2004-04-19 22:30:49 #

Does anybody know this one: ?
The following InnerException reported: System.Runtime.InteropServices.COMException (0x8004020E): The server rejected the sender address. The server response was: 451 failed to open files for write

Note the aspnet account has full read/write access to mailroot and subdirs.

JV [ nospam ( at ) heaven dot org ], 2004-04-29 14:12:22 #

Have had horrible time trying to send emails from within a windows service. The inner exception kept saying "System.IO.FileNotFoundException: The specified module could not be found."

Tried heaps of variations and eventually tried it without specifying the smtpserver - it worked! then tried with various different smtpservers - failed!

Remembered the suggestion 6 here and tried it - and it worked!

weird

thanks for a good site

Gerard [ gerardl ( at ) networkpro dot co dot nz ], 2004-05-16 22:22:38 #

Hi,

Thanks for the tips, I wrestled with this problem for months now.

I got a newer version (6.5.6944.0) of CDOEX.DLL from http://www.dynamiclink.nl/frames/dll.htm

This didn't work at first but a closer examination of the inner exception learned that i was using relative paths to create attachments while absolute paths are required.

Works great now!!

Geert-Jan [ g dot thomas ( at ) topskills dot nl ], 2004-06-16 05:43:06 #

We ran into the cryptic CDO.Message errors because of unnoticed bare newlines that had gotten into the db record data used to construct html emails. What was more aggravating was that the CDO.Message errors were misleading, we thought the issue was a mailserver setting triggering the smtp relay rejections.

Hope this saves your mail server admins some of the headache we gave ours.

Scott [ sfultz ( at ) communityseason dot com ], 2004-06-16 18:18:04 #

This is actually true! I tried all five suggestions and they didn't help and only sixth worked well

Vlad [ vlad ( at ) datlin dot com ], 2004-06-25 06:41:35 #

Suggestion 6 will not actualy set the value for SmtpServer. This has to do with strings in .net being immutable (cannot be changed after being created). What this means is that when making a call to string.Insert the underlying string that Insert is called on is not changed. The following example will demonstrate this.

Console.WriteLine( "SmtpMail.SmtpServer == '{0}'", SmtpMail.SmtpServer );
SmtpMail.SmtpServer.Insert( 0, "localhost" );
Console.WriteLine( "SmtpMail.SmtpServer == '{0}'", SmtpMail.SmtpServer );
SmtpMail.SmtpServer = "localhost";
Console.WriteLine( "SmtpMail.SmtpServer == '{0}'", SmtpMail.SmtpServer );
SmtpMail.SmtpServer.Insert( 0, "XXXXXXX" );
Console.WriteLine( "SmtpMail.SmtpServer == '{0}'", SmtpMail.SmtpServer );

output:
SmtpMail.SmtpServer == ''
SmtpMail.SmtpServer == ''
SmtpMail.SmtpServer == 'localhost'
SmtpMail.SmtpServer == 'localhost'

So, using the method in Suggestion 6 is no different than not setting the SmtpServer property (or setting it to null or string.Empty). Using Lutz Roeders Reflector (http://www.aisto.com/roeder/dotnet/) I was able to see that the following fields are being set on the COM CDO.Message class if the SmptMail.SmtpServer contains a value. (name of field , value assigned)

"http://schemas.microsoft.com/cdo/configuration/sendusing";, 2
"http://schemas.microsoft.com/cdo/configuration/smtpserver";, [SmtpMail.SmtpServer]
"http://schemas.microsoft.com/cdo/configuration/smtpserverport";, 25

Joe Sadowski [ joe ( at ) joesadowski dot com ], 2004-07-06 13:22:08 #

Thanks for the help! Suggestion 6 did the trick.

Misha [ foo ( at ) bar dot com ], 2004-07-15 14:56:46 #

Becareful in using
SmtpMail.SmtpServer.Insert( 0, "127.0.0.1 or your mail server name here")

Although the exception is not thrown it does not mean that your email will actually be sent. I tried this method and it is true that the CDO.Message did not get thrown but the email attempt to send outside the company domain did not occur either.

Tom [ norra ( at ) worldnet dot att dot net ], 2004-08-02 08:50:19 #

Hi!
First, i´m from spain so my english y very poor.. excuseme.
I found this solution: If you have installed OUTLOOK EXPRESS (i don´t know if in outlook 200x is the same) be sure that in "email count property", in "server" tab, the option "my server requiered autentication" is DISABLED
This solve mi problem, i´m working in a big Lan and in same PCs can´t send emails from the app, just the Pcs who´s has this option enabled... Good Luck!! Salu2!!

Ticoadf [ tico_miguel ( at ) hotmail dot com ], 2004-09-10 05:24:44 #

i don't have local smtp server.if i run my exe directly on smtp server then its running properly.but if i run the same exe from my local machine then its give the error "Could not access 'CDO.Message'" .i want to know what is the problem.what sholud i do?

regards
sanghamitra

sanghamitra [ mitra_panda ( at ) rediffmail dot com ], 2004-09-23 01:26:26 #

n/t

dave g [ dgrant ( at ) brierley dot com ], 2004-09-27 15:41:20 #

Getting rid of this line msg.BodyFormat = MailFormat.Html; solved it for me.

kisavorobyaninov [ kisavorobyaninov ( at ) hotmail dot com ], 2004-10-01 14:30:38 #

I was getting the same exception but only under a Windows Service application that I have. In that case I had to make the code that sends the email execute on a secondary (new) thread, otherwise it would crash. Interestingly enough it won't crash every single time but I just couldn't live with that.
The solution was to create a helper class with properties for the email message (to, from, body, attachments, etc) with a Send() method and pass the send method as the new Thread start point.

EmailSender email = new EmailSender("joedoe@someserver.com", "myservice@myserver.com",
"Look at This", "yada yada yada ..... ");
Thread secondaryThread = new Thread(new ThreadStart(email.Send));
secondaryThread.Start();

Sergio Pereira [ tjoker dot removeThis ( at ) bol dot com dot br ], 2004-10-04 06:21:51 #

Hi...I have had a look through your suggestions but I am still confused.

I am using system.web.mail to send messages and it has been working fine. The smtpserver was set to my service provider (the same as my outlook setting). All of a sudden, I am getting an InnerException of "Library Not Registered".

Outlook is still sending messages without a problem.

If I am using my ISP SMTP setting, am I correct in assuming that I am not using the SMTP server in IIS on my machine and that any changes made here would have not effect on the problem?

There are 2 things that have changed since my app was last working: 1. Installation of Windows Automatic Updates (Sevice pack 2 Win XP) and 2. Changing from static ip on a WLAN to dynamic. WLAN is connected to a DSL Router. Would any of these be responsible for the problem? My internet connectivity is fine as is the sending and receiving of mail via outlook.

Please help!

Thanks...
Jean

Jean [ genie ( at ) saol dot com ], 2004-10-18 01:07:58 #

Server: Windows 2000
.Net Framework: v1.1.4322.573

I have this error message occurring on my production server. The production server is also my email server running exchange. I have tried your suggestions above and it still doesn't seem to work. When running on my development server it works fine. I have created a class in asp.net that sends out an email message. It used to work on the production server but now it doesn't? I never made any changes to the application. So, I tried using the application from my machine
(development server) and it works fine. I setup both to use the exact same SMTPServer as "mail.whatever.com" and still the developer server works but the production server does not. I tried with the ip address and still no success on the live server. Any ideas? Maybe a service that I should check to see if it is running? The SMTP service is running. Thank you in advance for your help. Is it possible that maybe the CDO dll file is corrupt? If so, how do I replace it?

------------------------------------
ERROR MESSAGE:
------------------------------------
The following exception occurred: System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040211): The message could not be sent to the SMTP server. The transport error code was 0x800ccc15. The server response was not available --- 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.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args) --- End of inner exception stack trace --- at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at forms._0.Page_Load(Object sender, EventArgs e)
--------------------------------
The following InnerException reported: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040211): The message could not be sent to the SMTP server. The transport error code was 0x800ccc15. The server response was not available --- 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.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
--------------------------------
The following InnerException reported: System.Runtime.InteropServices.COMException (0x80040211): The message could not be sent to the SMTP server. The transport error code was 0x800ccc15. The server response was not available

Black Myst [ black_myst ( at ) hotmail dot com ], 2004-11-05 07:19:14 #

I am using standard .net code to send emails within a loop.

for ....
mail = new MailMessage()
mail.from = fromadd
mail.Body = body
mail.Subject =subject
SmtpMail.SmtpServer = "mysmtpserver"
SmtpMail.send(mail)
mail = nothing
next....

Even for just couple of Yahoo addresses I get success on one address and then failure for others

Error: The transport lost its connection to the server.

Point to note is that randomly some emails go through while the rest fail.

Can anyone explain?

Rahul [ rpandhe ( at ) hotmail dot com ], 2004-11-15 10:56:51 #

Hi !

I want to send e-mails to many addresses with different attachments from an ASP.NET application. I use a For..Next cycle to do it. The first e-mail successfully goes out but the others fail with this "Could not access 'CDO.Message' object." error message.

I'm sure the attachment files are exitst and other applications don't lock them. Every mail contains different file as attachment so they cannot lock the attachments of each other.

If I refresh the sender page the very first message goes out again succesfully.

I create a new MailMessage and a new MailAttachment object in each sequence of the For...Next

The only thing that not change is the SmtpMail object. I feel the source of the error from here. Can I initialize it somehow before sending the mails ?
Or do you have any other idea what the problem can be ?

Thanks for help in advance !

Jules

Jules Blaidd [ julesbladd ( at ) yahoo dot com ], 2004-11-24 06:57:19 #

Hi,

I'm getting this error as well, and I just can't figure out where the error is originated. I tried just about everything I could find on the internet, including this site.

Can someone take a look at my stack trace to see if you can point me in the right direction? Any help would be greatly appreciated! I'm desperate...

--- Stack Trace ---
"System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040213): De transportfunctie kan geen verbinding maken met de server.

--- 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.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Type type, Object obj, String methodName, Object[] args)
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
--- End of inner exception stack trace ---
at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args)
at System.Web.Mail.CdoSysHelper.Send(MailMessage message)
at System.Web.Mail.SmtpMail.Send(MailMessage message)
at ConsoleApplication1.Module1.Main() in C:\Documents and Settings\Wouter\My Documents\Visual Studio Projects\ConsoleApplication1\Module1.vb:line 31"
--- End Stack Trace ---

Thanks a milion.

El Loco

elloco [ elloco999 ( at ) hotmail dot com ], 2004-12-13 08:14:11 #

Thanks for that - it worked a treat.

ben [ ben ( at ) hyl dot co dot uk ], 2005-02-09 14:38:26 #

Has anyone seen this before?

System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040211): The message could not be sent to the SMTP server. The transport error code was 0x800ccc13. The server response was 354 Start mail input; end with <CRLF>.<CRLF>

Shane [ shane ( at ) shanebauer dot com ], 2005-02-14 07:00:46 #

I tried everything in the list and almost went back to using the CDONTS object which always worked. After experimenting, here is how I solved the error:
1. Uninstalled SMTP Server
2. Reinstalled SMTP Server
3. Ran Windows Update and updated Outlook Express
4. Applied Suggestion 2 (Relay Permission)
5. Under SMTP Properties, Access Tab, clicked Connection button.
6. Selected "Only the list below" and clicked Add.
7. Typed in 127.0.0.1

Hope this helps.

Josh [ nospam ( at ) yahoo dot com ], 2005-02-27 07:51:46 #

Good afternoon,
I'm getting "Could not access 'CDO Message' object"
with inner exception: "the 'SendUsing' configuration value is invalid".

I'd appreciate any help.
Thanks

pat [ lynchnco ( at ) patmedia dot net ], 2005-02-27 09:40:34 #

Firstly i face the error "ERROR:Could not access 'CDO.Message' object",after visiting ur site & reading solutions this problem is solved.
Now code z executing without any error ,but i'm not able to send email successfully.

The VB Code to send email is:

Dim email As New System.Web.Mail.MailMessage()
email.To =" urfr_trups@yahoo.com" email.From = "trupti_pandilwar@yahoo.com"
email.Body = "Hi!!How r u?"
email.Subject = "Hello!"
email.BodyFormat = Web.Mail.MailFormat.Text
'System.Web.Mail.SmtpMail.SmtpServer = "127.0.0.1"
SmtpMail.SmtpServer.Insert( 0, "127.0.0.1")
System.Web.Mail.SmtpMail.Send(email)

What should i do now?
Please help me to solve my problem..

Thanks very much.

Trupti Pandilwar [ trupti_pandilwar ( at ) yahoo dot com ], 2005-03-10 05:14:26 #

Yes indeed after unravelling the inner exception it turned out the mail had simply been rejected.

pat capozzi [ pat dot capozzi ( at ) excell dot com ], 2005-03-17 20:18:53 #

This is my code :
MailMessage mail = new MailMessage();
mail.To = "you@destination.be";
mail.From = "me@mylocation.be";
mail.Subject = "mysubject ";
mail.BodyFormat = MailFormat.Html;
mail.Body = "hello world";
SmtpMail.SmtpServer = "myserver";
SmtpMail.Send(mail);

When i run this code from a console application it works fine in both MailFormat.Html and MailFormat.Text format, but when i run it from an aspx page i can only use MailFormat.Text format. In MailFormat.Html format I get the "Could not access CDO.Message object" eror. I have already tried to put html and body tags around my text but this does not help.
It is driving me crazy !
Any suggestions ?

If it is of any use, this is the innerexeption :
The following exception occurred: System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040605): Unknown Error --- 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.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args) at System.Web.Mail.LateBoundAccessHelper.SetProp(Type type, Object obj, String propName, Object propValue) at System.Web.Mail.LateBoundAccessHelper.SetProp(Object obj, String propName, Object propValue) --- End of inner exception stack trace --- at System.Web.Mail.LateBoundAccessHelper.SetProp(Object obj, String propName, Object propValue) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at deschutter.com.PackFlow.Web.InviteApprovers.SendMail(String toList, String pdfUrl) in c:\inetpub\wwwroot\packflow\inviteapprovers.aspx.cs:line 77--------------------------------The following InnerException reported: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040605): Unknown Error --- 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.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args) at System.Web.Mail.LateBoundAccessHelper.SetProp(Type type, Object obj, String propName, Object propValue) at System.Web.Mail.LateBoundAccessHelper.SetProp(Object obj, String propName, Object propValue)--------------------------------The following InnerException reported: System.Runtime.InteropServices.COMException (0x80040605): Unknown Error

martin devos [ martind ( at ) deschutter dot be ], 2005-03-30 06:41:28 #

Hi All,

This is the first time I had a CDO issue with my VB.NET just on ONE server. I was not getting an authentication issue, but a transport issue. Using the Insert command fixed it straight away, then I realised why. This server did not have any Outlook or other mail program other than Outlook Express. OE was not setup to point to an smtp server. When I was doing the usual SmtpMail.SmtpServer = "127.0.0.1"
is was actually adding the address onto the mail server index (you can find the Index 0 setting in the regitry), and trying to send mail out the "invalid" or index 0 smtp entry. By inserting the valid smtp server into index 0, it works.

Robear [ robear ( at ) joshie dot com dot au ], 2005-04-12 20:00:13 #

After trying every suggestion and combination this is what we found finally worked for us (we use Remoting and our own ASPNET machine account). Try this:

1. Don't set the SMTP server (SmtpMail.SmtpServer), it's the same as using the suggested SmtpMail.SmtpServer.Insert(0, "127.0.0.1"). Just call SmtpMail.Send()

2. Set write permissions for the ASPNET machine account (or whatever account defined in machine.config) on the inetpub\mailroot folder.

Someone suggested to alter the metabase and set read permission, we tried that and it didn't help, but it could according to Microsoft: "No special permissions are required to run interactive applications or ASP pages to enable use of CDOSYS. In applications that use the SMTP or NNTP drop-directory, the application or user must have permission to write into that directory. When running an application that sends e-mail, the user will require either write access to the pick-up directory, or read access to the IIS metabase so the application can determine the SMTP port used for sending mail."

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/e2k3/e2k3/_techsel_criteria_20.asp

frasse [ lisse ( at ) sverige dot nu ], 2005-04-21 09:44:40 #

Hi check my link here.

http://spaces.msn.com/members/devicharan/

you have solution there

could not access cdo.message object [ devicharan dot vinnakota ( at ) majoris dot com ], 2005-04-27 22:48:14 #

i m sending email with attaching pdf file greater than 100 kb size and it will give me error unspecified error
plz solve my prob immediately

ashwini [ ashwini_svartak ( at ) hotmail dot com ], 2005-05-06 01:19:45 #

I tried a lot of what you said here and found a few things out, the SmtpMail.SmtpServer.Insert( 0, mailServer) appears to just use the local host (default) SMTP server I guess it works for a lot of people because there local server is setup differently to their mail server.

The following seemed to be the most robust setting for mailing from ASP.NET for me.


SmtpMail.SmtpServer = mailServer;
MailMessage mailMessage = new MailMessage();
mailMessage.BodyFormat = MailFormat.Text ;
mailMessage.From = from;
mailMessage.To = recipient;
mailMessage.Subject = subject;
mailMessage.Body = body;

mailMessage.Headers.Add("Reply-To",from);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpconnectiontimeout";, 60);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";, "1");
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername";, username);
mailMessage.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword";, password);

SmtpMail.Send(mailMessage);

The mail server in this case is an exchange server.

This info was snatched from http://www.devnewsgroups.net/group/microsoft.public.dotnet.framework/topic11061.aspx


D

Great site, it was invaluable.

David [ dsmith ( at ) origin-data dot co dot uk ], 2005-05-09 09:11:03 #

Can somebody explain why that works?

David [ profnachos ( at ) yahoo dot com ], 2005-05-10 13:24:36 #

By default, VirusScan in its infinite wisdom blocks SMTP from unknown apps. To shut this off, go to the VirusScan console and uncheck the SMTP rule.

Michael Carr [ mcarr ( at ) umich dot edu ], 2005-05-21 17:41:46 #

After many hours of looking through everybodies answers I didnt see anything that had to do with a Desktop solution. So here is what i did to get mine working;

You have to uninstall Outlook express. Reinstall it then register the cdosys.dll

In the run command;
regsvr32 "c:\WINDOWS\system32\cdosys.dll

Michael McMullen [ plasma_z ( at ) mail dot com ], 2005-06-04 12:23:13 #

Greetings, all:

I thought I would offer up something that worked for us here, that I did not see in all the discussions.

Our company uses an enterprise edition of McAfee AntiVirus. This means on every computer in the building, there are two little icons in the system tray that look like roman shields, and all their menu items are disabled by administrative domain policy so that we cannot reconfigure them in any way.

Turns out, McAfee was blocking TCP 25 Outbound on our computers. (We use Outlook / Exchange for mail here, which uses MAPI over RPC ports).

So I goto Administrative Tools -> Services and disable the three "McAfee" and "Network Associates" related services, and presto, my code can send an SmtpMail.

Peace & stuff!

Mike Labosh, MCSD
"Escriba coda ergo sum." -- vbSensei

Mike Labosh [ mlabosh ( at ) hotmail dot com ], 2005-06-17 13:18:00 #

I have tried the code below and it is working:
BN: I am using VB.NET with VS.NET Architect 2003

1. Add the COM reference "Microsoft ActiveX Data Objects 2.8 Library"
2. Add the COM reference "Microsoft CDO for Windows 2000 Library" or browse it at "c:\windows\system32\cdosys.dll"
3. Use the following sub to send your message. Provide the required parameters:

Public Sub SendMail(Byval AdrFrom As String ByVal AdrTo As String, ByVal AdrCC As String, ByVal MailBody As String)

Try
Dim oMessage As CDO.Message
'Create a Message Object
oMessage = CreateObject("CDO.Message")

With oMessage
'Set the properties
.To = AdrTo
.From = AdrFrom
.TextBody = MailBody
.Subject = "Reminder: Actions to take for listed Staff"
.Configuration.Fields.Item("CdoSendUsing").Value = CDO.CdoSendUsing.cdoSendUsingPickup 'Using Exchange Server
.Configuration.Fields.Update()
.Send()
End With
Catch ex As Exception
Console.WriteLine(ex.Message)
End Try
End Sub

I hope this will help many of you.

Gildas Makaya [ makayag ( at ) afro dot who dot int ], 2005-06-22 04:19:14 #

I had this problem and found that The .Net library use the default e-mail account for sending e-mail. Setting correct e-mail account as default e-mail account in outlook express resolved my problem.

Kashif Mushtaq [ kashifmushtaqpak ( at ) yahoo dot com ], 2005-07-06 15:48:42 #

Dear Sir
We r from dimensionslive.com and we have a problem in sending mail from our subdomain "gotopoints.dimensionslive.com" but this mailing sevice is working smoothly in our local Server.Please give me ur suggestion to how can i sove this problem?

we r getting an error that i iveb bellow

System.Web.TraceContextSystem.Web.TraceContext


System.Web.TraceContext

Could not access 'CDO.Message' object.Customer at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at GoToPoints.Business.GiftCertificate.mailtoCustomer() in c:\inetpub\wwwroot\gotopoints\business\giftcertificate.aspx.cs:line 96

System.Web.TraceContext
Could not access 'CDO.Message' object.business at System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at GoToPoints.Business.GiftCertificate.mailtoBusinessOwner() in c:\inetpub\wwwroot\gotopoints\business\giftcertificate.aspx.cs:line 64

Thankyou
Rakesh Sankar

Rakesh [ rakeshsankar007 ( at ) yahoo dot co dot in ], 2005-07-12 00:35:32 #

My sending mail logic is built into a .net library dll. When invoked from a Windows application built using .NET the sending mail works. When invoked from a asp.net web application it fails with the following error. I have gone through all your articles and found that only cdosys.dll is loaded. But still get this error.

Library not registered.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and w