Sending emails with attachments

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First a function to emulate ShellExecute:

Private Function SendEmail(ByVal MailtoSyntax As String) As Boolean
  Dim myProcess As New Process
  myProcess.StartInfo.FileName = MailtoSyntax
  myProcess.StartInfo.UseShellExecute = True
  myProcess.StartInfo.RedirectStandardOutput = False
  myProcess.Start()
  myProcess.Dispose()
End Function

The mailto: syntax is handled by windows to use the default mail client. You can use the following code to build the email string and "execute" it:

Dim mailto As New System.Text.StringBuilder
mailto.Append("mailto:teste@gmail.com")
mailto.Append("&cc=testcc@testcc.com,testcc1@testcc.com")
mailto.Append("&bcc=testcc@testbcc.com,testcc1@testbcc.com")
mailto.Append("&subject=test subject")
mailto.Append("&body=Look to attachment")
mailto.Append("&Attach=" & Strings.Chr(34) & Strings.Chr(34) & "c:\teste.html" & Strings.Chr(34) & Strings.Chr(34))
SendEmail(mailto.ToString)

Please note that the file must exist and that some file extensions (.zip, .rar, and .exe) are blocked by default (e.g. Outlook 2003). You must change Email client security to allows specific extensions.