DNSBLs and RBLs

GreenArrow Engine can optionally use DNSBLs (DNS-based Blackhole Lists), such as the ZEN Spamhaus List to filter incoming mail.

1. To control which DNSBLs to use, list them one per line in the /var/hvmail/control/smtp.rbls file. For example:

   echo "zen.spamhaus.org" >> /var/hvmail/control/smtp.rbls
   

2. To disable checking DNSBLs, delete the /var/hvmail/control/smtp.rbls file:

   rm -f /var/hvmail/control/smtp.rbls
   

3. 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.