DNSBLs and RBLs
GreenArrow Engine can optionally use DNSBLs (DNS-based Blackhole Lists), such as the ZEN Spamhaus List to filter incoming mail.
To control which DNSBLs to use, list them one per line in the
/var/hvmail/control/smtp.rblsfile. For example:
echo "zen.spamhaus.org" >> /var/hvmail/control/smtp.rbls
To disable checking DNSBLs, delete the
rm -f /var/hvmail/control/smtp.rbls
Apply changes by restarting the SMTP service, and verifying that it stays up for at least 5 seconds:
svc -t /service/hvmail-qmail-smtpd sleep 7 svstat /service/hvmail-qmail-smtpd
If the SMTP service does not stay up for at least 5 seconds, reverse your change.