2002/01/21
  assorted fixes; getting dnsbl's to actually work

  fixing the maximum message size (databytes) stuff (thanks for the
  spot to Andrew Pam <xanni@glasswings.com.au>)

  support and enable taint checking (thanks to Devin Carraway
  <qpsmtpd@devin.com>)

  Make the MAIL FROM host dns check configurable. (thanks to Devin
  Carraway).

  Add more documentation to the README file.