problems with NDRs and spam

[pviqueira]

Hello,

I have a ISA SERVER 2006 firewall with IIS 6.0 installed and with smpt service. This server is a relay to my MS Exchange server.
I have a problem with NDRs and spam. This smtp relay is continuously trying to send NDRs to non-existent domains and its queue is growing indefinitely. This is mail's example that my "ISA SMTP relay" is trying to send:


FROM: postmaster@smeagol.mydomain.es
TO: tzlightning@crazy.ru
Subject: Notificación de estado de entrega (Error)


Esta es una Notificación de estado de entrega generada automáticamente.

Error en la entrega a los siguientes destinatarios.

mt@mydomain.es

Are there any way to disable NDRs in the IIS SMTP.

Thanks.

Pablo