Problems when writing a SMTP client and talk with the hotmail

22 Sep 2006 1:53 AM

oliu321

Hi,
    First I am not trying to write a client to talk with hotmail
straightly. I am trying to write some codes to send emails through a
SMTP
server. I wrote a C++ version using pure socket programming and SMTP
protocol, a VB version using CDO and a C# version using
System.Net.Mail. Now all of them works great with any email account but

hotmail. So here is the C# code:

            MailAddress from = new MailAddress("Z***@CCC.com", "XXX");
            MailAddress to = new MailAddress("S***@hotmail.com",
"YYY");

            MailMessage mail = new MailMessage(from, to);

            mail.Subject = "Test only, please don't block me";
            mail.Body = "Test only, please don't block me";

            SmtpClient client = new SmtpClient("xxx.xxx.xxx.xxx");
            client.Send(mail);

     here is the VB Code:
       Set objMessage = CreateObject("CDO.Message")
       objMessage.Subject = "Test only, please don't block me"
       objMessage.Configuration.Fields.Item _
          ("http://schemas.microsoft.com/cdo/configuration/smtpserver")

= "xxx.xxx.xxx.xxx"
       objMessage.From = "Z***@CCC.com"
       objMessage.To = "S***@hotmail.com"
       objMessage.TextBody = "Test only, please don't block me"
       objMessage.Send

     I wouldn't put C++ code here because it's too long.

     1. I can use Outlook to send out email (on the same machine where
my code runs) and hotmail will receive it with no problem. So I know my

SMTP server was not blocked by Hotmail.
     2. My SMTP server doesn't require authentication, I know it's bad.

But I can't change that.
     3. Somebody told me that I would need some strange header to make
the hotmail like my email. Therefore I set up a sniffer and get all
headers which are used by Outlook. I used all of them in my C++ code
but it still doesn't work.

      Now this hotmail problem drives me crazy and I have wasted 4
hours on it with no clue. Can anybody help me out of here?

Thanks
Ou

     P.S It's a little bit ironic to see that MS' product doesn't work
well on its own product.

22 Sep 2006 9:01 AM

Willy Denoyette [MVP]

<oliu***@gmail.com> wrote in message
Show quoteHide quote

news:1158890022.311651.287040@m7g2000cwm.googlegroups.com...
| Hi,
|    First I am not trying to write a client to talk with hotmail
| straightly. I am trying to write some codes to send emails through a
| SMTP
| server. I wrote a C++ version using pure socket programming and SMTP
| protocol, a VB version using CDO and a C# version using
| System.Net.Mail. Now all of them works great with any email account but
|
| hotmail. So here is the C# code:
|
|            MailAddress from = new MailAddress("Z***@CCC.com", "XXX");
|            MailAddress to = new MailAddress("S***@hotmail.com",
| "YYY");
|
|
|            MailMessage mail = new MailMessage(from, to);
|
|
|            mail.Subject = "Test only, please don't block me";
|            mail.Body = "Test only, please don't block me";
|
|
|            SmtpClient client = new SmtpClient("xxx.xxx.xxx.xxx");
|            client.Send(mail);
|
|
|     here is the VB Code:
|       Set objMessage = CreateObject("CDO.Message")
|       objMessage.Subject = "Test only, please don't block me"
|       objMessage.Configuration.Fields.Item _
|          ("http://schemas.microsoft.com/cdo/configuration/smtpserver")
|
| = "xxx.xxx.xxx.xxx"
|       objMessage.From = "Z***@CCC.com"
|       objMessage.To = "S***@hotmail.com"
|       objMessage.TextBody = "Test only, please don't block me"
|       objMessage.Send
|
|
|     I wouldn't put C++ code here because it's too long.
|
|
|     1. I can use Outlook to send out email (on the same machine where
| my code runs) and hotmail will receive it with no problem. So I know my
|
| SMTP server was not blocked by Hotmail.
|     2. My SMTP server doesn't require authentication, I know it's bad.
|
| But I can't change that.
|     3. Somebody told me that I would need some strange header to make
| the hotmail like my email. Therefore I set up a sniffer and get all
| headers which are used by Outlook. I used all of them in my C++ code
| but it still doesn't work.
|
|
|      Now this hotmail problem drives me crazy and I have wasted 4
| hours on it with no clue. Can anybody help me out of here?
|
|
| Thanks
| Ou
|
|
|     P.S It's a little bit ironic to see that MS' product doesn't work
| well on its own product.
|

Sending mail to an hotmail recipient is exactly like sending to any other
mail recipient, all you are doing is sending mail to your SMTP server,
point. Your SMTP server will find out how to forward the mail to hotmail
(which uses SMTP anyway) or whatever.
Without seeing your complete code, it's nearly impossible to tell you what's
wrong, all I can say is that:
- you must be sure that xxx.xxx.xxx.xxx corresponds to your smtp host.

SmtpClient client = new SmtpClient("xxx.xxx.xxx.xxx");

- your display name (XXX) must be correct as it overrides the address....
MailAddress from = new MailAddress("Z***@CCC.com", "XXX");

just try using only the address.

Willy.

22 Sep 2006 11:00 AM

Ciaran O''Donnell

Here's someone elses views :
http://www.velocityreviews.com/forums/t100989-smtp-email-problem.html

HTH

Ciaran O'Donnell

Show quoteHide quote

"oliu***@gmail.com" wrote:

> Hi,
>     First I am not trying to write a client to talk with hotmail
> straightly. I am trying to write some codes to send emails through a
> SMTP
> server. I wrote a C++ version using pure socket programming and SMTP
> protocol, a VB version using CDO and a C# version using
> System.Net.Mail. Now all of them works great with any email account but
>
> hotmail. So here is the C# code:
>
>             MailAddress from = new MailAddress("Z***@CCC.com", "XXX");
>             MailAddress to = new MailAddress("S***@hotmail.com",
> "YYY");
>
>
>             MailMessage mail = new MailMessage(from, to);
>
>
>             mail.Subject = "Test only, please don't block me";
>             mail.Body = "Test only, please don't block me";
>
>
>             SmtpClient client = new SmtpClient("xxx.xxx.xxx.xxx");
>             client.Send(mail);
>
>
>      here is the VB Code:
>        Set objMessage = CreateObject("CDO.Message")
>        objMessage.Subject = "Test only, please don't block me"
>        objMessage.Configuration.Fields.Item _
>           ("http://schemas.microsoft.com/cdo/configuration/smtpserver")
>
> = "xxx.xxx.xxx.xxx"
>        objMessage.From = "Z***@CCC.com"
>        objMessage.To = "S***@hotmail.com"
>        objMessage.TextBody = "Test only, please don't block me"
>        objMessage.Send
>
>
>      I wouldn't put C++ code here because it's too long.
>
>
>      1. I can use Outlook to send out email (on the same machine where
> my code runs) and hotmail will receive it with no problem. So I know my
>
> SMTP server was not blocked by Hotmail.
>      2. My SMTP server doesn't require authentication, I know it's bad.
>
> But I can't change that.
>      3. Somebody told me that I would need some strange header to make
> the hotmail like my email. Therefore I set up a sniffer and get all
> headers which are used by Outlook. I used all of them in my C++ code
> but it still doesn't work.
>
>
>       Now this hotmail problem drives me crazy and I have wasted 4
> hours on it with no clue. Can anybody help me out of here?
>
>
> Thanks
> Ou
>
>
>      P.S It's a little bit ironic to see that MS' product doesn't work
> well on its own product.
>
>