> Hi
>
> Which class are you using to send the mail?
> In dotnet we have a managed class will handle the send mail issue.
>
> Here is a link you may have a try.
> How To Send E-mail Programmatically with System.Web.Mail and Visual Basic
> NET
> http://support.microsoft.com/?id=314201
>
> Also what is the attachment file type and size are you using.
> e.g. Usually *.exe or .vbs file is not valid in the mailattachment and in
> some case the attachment larger than certain limitation is also not
> allowed
> which is based on the rule setting on the smtp server.
>
> You may also try with a simple plain text mail with a simple small
> compressed file(e.g. zip file) to see if the problem persists.
>
> Also you may try to use the mail client to send the mail with the identity
> smtp server setting to see if that works.
>
> You may have a try and let me know the result.
>
> Best regards,
>
> Peter Huang
> Microsoft Online Partner Support
>
> Get Secure! - www.microsoft.com/security
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>