[IMGate] updated header_checks_bogon.regexp

[Len Conrad]

http://www.cymru.com/Documents/bogon-dd.html

Some Class A in, some out.

Also, if you use the bogon list for your bind blackhole, update that, too.

/Received\: .*\[
  (0\.
  |1\.
  |2\.
  |5\.
  |7\.
  |23\.
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  |169\.254\.
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  |224\.)/x REJECT ACL header_checks_bogon Message contains a Received: 
header containing a forbidden "bogon" IP address from an unassigned Class 
A  network.  See http://www.cymru.com/Documents/bogon-list.html, IP = "[$1]"