Implement greylisting feature

Greylisting (or graylisting) is a method of defending e-mail users against spam.

With this feature, qmail will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate the originating server will, after a delay, try again and, if sufficient time has elapsed, the email will be accepted. If the mail is from a spam sender, sending to many thousands of email addresses, it will probably not be retried.

We 'll make use of Perl scripts jgreylist and jgreylist-clean written by John Simpson

Edit /var/qmail/supervise/qmail-smtpd/run and change the following

	GREYLIST="/var/qmail/bin/jgreylist"

	JGREYLIST_DIR="$VQ/jgreylist"

cp /downloads/scripts/jgreylist /var/qmail/bin
cp /downloads/scripts/jgreylist-clean /usr/local/sbin
chown root:vchkpw /var/qmail/bin/jgreylist
chmod 0750 /var/qmail/bin/jgreylist
chown root:root /usr/local/sbin/jgreylist-clean
chmod 0755 /usr/local/sbin/jgreylist-clean

mkdir -m 0700 /var/qmail/jgreylist
chown vpopmail:vchkpw /var/qmail/jgreylist
echo '/usr/local/sbin/jgreylist-clean 2>&1 > /dev/null' > /etc/cron.daily/jgreylist-clean
qmailctl restart

OPTIONAL : If you need more performance you can use a compiled version of jgreylist

cd /downloads/scripts/
mv /downloads/scripts/jgreylist /downloads/scripts/jgreylist.pl
make jgreylist
cp /downloads/scripts/jgreylist /var/qmail/bin
chown root:vchkpw /var/qmail/bin/jgreylist
chmod 0750 /var/qmail/bin/jgreylist

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