Blocked email reply

Hi experts,

I am using SBS 2008 with Exchange 2007. My email works via SMTP, but goes through MXToolbox which is able to spool email if the server is down along with other things. There are a few places where I can block incoming email from specific email addresses and/or domains.

Currently, I am blocking the four email addresses via MXToolbox. I have tested this by blocking an email from another account of mine, and when I send an email to my email address on my domain it does, indeed, return a message stating that the email was rejected. It appears to be like the standard notice one would get if an email were sent to an address which was not working.

The problem is I want the sender to receive the rejection notice which makes it appear that the email address is no longer valid. 99% of the notice which I received back in my test, appears that way. The sender would be informed that their email was sent but was not delivered as the email address can longer accept email.

The problem lies in the fact that there is just one line that states the user was blocked by the recipient. I do not want the sender to know that I deliberately blocked their message. Given, this is the standard auto-reply, there is no way I can change it. Would there be a way in Exchange or Outlook itself, which would send a reply without that line. If I were able to write my own reply, I could even copy and paste the MXToolbox reply and leave that line out.

Thank you.

Who is Participating?
Simon Butler (Sembee)ConsultantCommented:
You have the same problem at the Exchange level - the NDRs are not controllable.
The only thing you could do is write a transport rule to generate an NDR of your choosing. It might not look exactly as you would like, you would need to experiment.

Simon Butler (Sembee)ConsultantCommented:
In most cases this kind of blocking is done by the remote server, which takes the text returned by the receiving server (so the mxtoolbox service) and generates and NDR. You would need to speak to mxtoolbox about whether it is possible to change their NDR text or not. I doubt whether it is though.

Bert2005Author Commented:
Thanks Simon,

You are correct on both counts. It is blocked at the point of MXToolbox, and it is their message (which is good because it looks like the type of message one would get -- i.e. very professional with, I believe, a 505 error message). I have spoken with them, and they can't change it. They did go out of their way by adding code so I could make my own. It has been a while so I can't remember why it didn't work well for me. I recall it was rather cumbersome.

Can I choose not to block it at that level (very easy to do) and block it directly at Exchange Server with possibly a different error message?

Thanks for your help.
Bert2005Author Commented:
I will give that a shot. Thanks.
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