Note: Please be aware that the VT Mail servers automatically block as many as 6,000 and more Internet sites that have a history of sending large amounts of spam or viruses before they reach your computer. For a current list of these sites, refer to Blocked E-mail Sites.

If your server is being blocked, but not by Virginia Tech, go to the following Web pages to see if your server's IP address is listed. If so, follow the instructions on the Web page to be removed.

• CBL (Composite Blocking List) Utility
• DSBL (Distributed Sender Blackhole List)
• Spamhaus' SBL (Spamhaus Block List) and XBL (Exploiting Block List)

Contents

• Status Header
• UCE Header
• Whitelisted Header
• Blacklisted Header

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Status Header:

 

X-Junkmail-Status: score=0/50, host=steiner.cc.vt.edu

• This header will be in every message that goes through the scanner.
• A non-zero score does not mean that it is spam.
• A score of over 50 means that it is probably spam.
• The name in the host section will change, depending on which scanner the message hit. Possible values at the moment are: zidane, steiner, dagger, vivi.

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UCE Header:

 

X-Junkmail: UCE(50)

• Any message with a score of 50 or more will get this header. These messages are most likely spam. Messages with a score of less than 50 will not have this header.
• The simplest filter would be to look for "X-Junkmail: UCE".
• Messages with this header should be treated as spam.

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Whitelisted Header:

 

X-Junkmail: Whitelisted

• If this header exists, then the message originated on one of the very few computers in the whitelist, which are mostly campus servers that send lots of official notes. Whitelist space is extremely limited.
• Messages with this header should probably not be treated as spam, even if the X-Junkmail: UCE header also exists.

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Blacklisted Header:

 

X-Junkmail: Blacklisted

• If this header exists, then the message was given to us by a computer on our black list. This is very rare.
• This is not the same as the UCE block list. Messages blocked by the UCE list are refused at our border and you will not see those. The sender of messages blocked by the UCE list will get the 550 message. For more information, see "550- This Domain is Blacklisted, Consult Your Postmaster" Error Message When Sending an E-mail Message to VT Mail Account.
• Messages with this header should be treated as spam.

black-listed ; black listed