PopRelay Support for milter-greylist.

In order to allow users of a conventional sendmail / pop3 setup to send email from a server running milter-greylist without being grey-listed, it is possible to feed an existing PopRelay authenticated pop3 recipient IP addresses database into the greylist.conf file.

In order to do that, you can set up a greylist.template file, which contains all static setup information, and patch the poprelay daemon (poprelayd) so it would create a new text-file from the database, containing setup information necessary to feed to milter-greylist.

rename the greylist.conf file to greylist.template

apply this patch to the poprelay 1.5 daemon file poprelayd. it calls the subroutine added_output should it exist.

The patch looks like this:

--- poprelayd	Tue Jan 21 20:35:50 2003
+++ patched/poprelayd	Tue Mar 23 12:27:17 2004
@@ -357,8 +357,9 @@
 	    $lasttimeout = time;
 	    timeoutdb(60 * $timeout_minutes);
 	}
 	closedb;
+	&added_output() if defined &added_output;
 	sleep $log_wait_interval;
     }
 }

add this addendum to the poprelay.conf file. it contains the added_output subroutine, which can be modified as needed.

The subroutine looks like this:

sub added_output {
#
# local settings - please adjust as needed
#

# where is greylist.conf etc. ?
#
	my $BASE='/etc/mail/greylist';
	my $GLT="$BASE.template";
	my $GLN="$BASE.conf.NEW";
	my $GLC="$BASE.conf";

# where are the system utilities 'awk', 'poprelayd', and 'cat' ?
#
	my $awk='/bin/awk';
	my $prd='/sbin/poprelayd';
	my $cat='/bin/cat';
	my $dif='/usr/bin/diff';

#
# local settings - setup finished.
#
	system(qq~$prd -p|$awk 'BEGIN{system("$cat $GLT");}{printf"addr \%s/32\\n",\$1;}'>$GLN~);
	my ($doit,$newf)=(0,0);
	if(-f $GLN) {
		$newf=1;
		if(-f $GLC) {
			my $result=`$dif -q $GLN $GLC > /dev/null`;
			my $ret=($? >> 8) & 127;
			$doit=1 if $ret==1;
		}
		else {	$doit=1; }
	}
	if($doit) {
		rename($GLN,$GLC); # should probably spit out an error if it fails
		$doit=$newf=0;
	}
	elsif($newf) {
		unlink($GLN); # should probably spit out an error if it fails
		$newf=0;
	}
}

After all this is done, you can shutdown and start your poprelay daemon, and it will continuously create changed greylist.conf files containing the most up-to-date data from the PopRelay authenticated pop3 recipient IP addresses database.