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Block or redirect 'Undisclosed Recipient'  Email addresses

Posted on 2001-06-11
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Last Modified: 2008-01-09
We receive spam with the recipient showing as "Undisclosed Recipient' in the address, yet it is being routed to the various individual's mailboxes.  Looking at the header info shows it as 'Undisclosed Recipient'.  

So...
1) Our Exchange 5.5 sp4 server is processing the email it is getting an address from somewhere.

2) How to block the 'Undisclosed Recipient' address when it doesn't show up in the header as an acceptable mail address?
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Question by:RayBailey
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Expert Comment

by:bluezoo7
ID: 6179105
"Undisclosed.Recipient" comes from Outlook Express users that BCC their recipients without putting anyone in the To field.

Block these messages as you would any other message. If you have a way to block messages with no one in the To field, this would be your best bet.

Check out this article from MS on the issue:

http://support.microsoft.com/support/kb/articles/Q250/6/92.ASP?LN=EN-US&SD=gn&FR=0&qry=undisclosed%20recipient&rnk=1&src=DHCS_MSPSS_gn_SRCH&SPR=MSALL

BZ7
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Author Comment

by:RayBailey
ID: 6181262
This answer does not give me any info on how to block any incoming SMTP message with an empty 'To:' from Exchange 5.5  If Exchange 5.5 cannot do this without a helper program the answer should state so.
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by:bluezoo7
ID: 6182513
My apologies for not being clear. To my knowledge, you cannot block mail based on the To field without 3rd-party tools.

Check out Mail Essentials (http://www.gfi.com/me/mailessentials.htm) and

MailSweeper (http://www.mailsweeper.com), aka MIMEsweeper.

BZ7
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bluezoo7 earned 200 total points
ID: 6182518
However, if you know the *sender* of the message, you can stop them this way:

MS KB article Q245465
http://support.microsoft.com/support/kb/articles/Q245/4/65.ASP?LN=EN-US&SD=gn&FR=0&qry=spam&rnk=11&src=DHCS_MSPSS_gn_SRCH&SPR=ECH

BZ7
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Author Comment

by:RayBailey
ID: 6182558
Thanks for the input.  I was afraid that Exchange wouldn't be able to do blocking itself.  Seems to be the nature of the beast.

That is the problem with SPAM.  You never know what the address is.  But I could block a lot of it just on the BCC rule itself.

Thanks bluezoo7
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