Milter-greylist

Hi Emmanuel,

I get a lot of spam forwarded from an external server to my server. The 
used SRS return path e.g. looks like this:

   <srs0+uc/j=ux=mailer-service.de=postmaster@...>

To block the forwarding server udag.de in sendmail access is not an 
option, because ham is also forwarded. Sendmail's access file doesn't 
support regular expressions on "From:" filter and I don't see further 
options with sendmail. Is there a way to block those messages with 
milter-greylist using something like this:

-------
list "superspammer" from { \
  *=mailer-service.de=*@... \
}

racl blacklist list superspammer msg "Spam blocked" flushaddr
-------

I'm using milter-greylist 4.3.9-1 on Ubuntu 12.04 LTS, but could build 
backports to newer version if necessary.

Ciao
Marcus