Cdonts erro 500 quando tento enviar email com ASP classic


NADA de pânico, reveja antes 2 coisas:

1 – se no log de erros do site aparece 800a0046|Permission_denied no momento do uso do CDONTS,
2 – Reveja todos os passos abaixo (Parallels):

[How-To] Installing CDONTS on Windows 2003 Server
Article ID: 560
Last Review: Sep, 23 2010



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Microsoft Windows Server 2003 does not install Collaboration Data Objects (CDO) for NTS (CDONTS). Therefore, applications using CDONTS do not work on Windows Server 2003-based computers. Windows Server 2003 provides improved alternatives to CDONTS.

For CDONTS to work in a Windows Server 2003-based computers, please do the following:

1. Download the attached CDONTS.ZIP file (you can also get CDONTS.DLL from the installation CD of your Windows 2000). Once downloaded, unzip CDONTS.DLL and put it in

For 32-bit systems:
%systemroot%\system32 folder (by default C:\Windows\system32).

For 64-bit systems:
%windir%\syswow64 (by default C:\Windows\syswow64).

2. Register the CDONTS.DLL component in the server using the following command:

For 32-bit systems:

regsvr32 “%systemroot%\system32\cdonts.dll”

For example:

C:\WINDOWS\system32>regsvr32.exe cdonts.dll

For 64-bit systems:

regsvr32 “%systemroot%\syswow64\cdonts.dll”

For example:

C:\WINDOWS\syswow64>regsvr32.exe cdonts.dll

3. Once the CDONTS.DLL component is registered, you should check if your SMTP service is running.

Go to Administrative tools, IIS and Expand your local machine. If the SMTP service is listed, it means it is already installed, if not you should install this service.

To install SMTP, do the following:

Go to Control Panel, Add/Remove Programs, Add/Remove Windows Components, Application Server, IIS, Select SMTP service, Click OK.

4. Change the port number for the SMTP service. The default port is 25. Use 25 only when no other SMTP service is running. If there is already another SMTP service running on the server, change the SMTP port of IIS, for example to port 8025.

You can make this through IIS management console: Control Panel, IIS, expand `local computer`, SMTP, Properties, General, click Advanced button, Edit.

5. Set up SMTP service. Most important is setting up a fully qualified domain name for the SMTP service: Control Panel, IIS, expand `local computer`, SMTP, Properties, Delivery, click Advanced button and set up Security service for SMTP.

It is required to give permissions to IIS_WPG standard IIS Worker Process Group. Control Panel, IIS , expand `local computer`, SMTP, Properties, Security, click Add button, then click Object types button…, select Groups element, click OK, enter IIS_WPG as object name to add and click OK.

Additional configuration: Select Authentication and check Anonymous Access and Integrated Windows Authentication. Click OK and then click CONNECTION. Set up the RELAY settings. Click DELIVERY tab and then click ADVANCED. Set up the MAX Count hop to the required value, even though we suggest setting it to at least 20.

Now the SMTP service of IIS is already configured.
Additional information
For additional information, please, refer to;en-us;324649



Depois de seguir os passos assim, caso você perceba que ainda assim não funciona normal o Cdonts faça algo mais interessante, abra o C:\Inetpub\Mailroot
Nesta pasta dê permissão para IUSR_NOMEDOPC (se o pc fosse nerdblog [hostname] seria iusr_nerdblog).
A permissão deve ser completa para ele.
Depois disso reinicie o IIS e prepare a caixa de BIS para minha casa.