@electronic{www.greylisting.org,
   title       = {Greylisting.org - Postfix implementations}, 
   url         = {http://www.greylisting.org/implementations/postfix.shtml},
   biburl      = {https://puma.uni-kassel.de/url/be7476f177266c29056c3a1e4c367b4b/hotho},
   keywords    = {greylisting mail postfix spam},
   added-at    = {2007-03-27T09:20:53.000+0200},
   description = {Postfix now includes the sample greylisting policy-daemon in the main release (2.1+):
www.postfix.org/SMTPD_POLICY_README.html#greylist.},
   interhash   = {be7476f177266c29056c3a1e4c367b4b}, 
   intrahash   = {be7476f177266c29056c3a1e4c367b4b}
}