Rocky, It seems that I am still having a few issues with the whitelist on the SpamSnake. I have a sender trying to get through to a recipient behind the spamsnake but the DNS lookup for the SPF portion of the filter is failing: Code: Apr 13 11:43:17 curve postfix/smtpd: NOQUEUE: reject: RCPT from unknown[18.104.22.168]: 450 4.7.16 <email@example.com>: Recipient address rejected: SPF-Result=mail.senderdomain.com: 'SERVFAIL' error on DNS 'SPF' lookup of 'mail.senderdomain.com'; from=<firstname.lastname@example.org> to=<email@example.com> proto=ESMTP helo=<mail.senderdomain.com> It appears that a DNS lookup for type "txt" is being done on the "helo" hostname. Since there is no SPF record for "mail.senderdomain.com", SPF lookup is having a cow. So I added the sender's IP 22.214.171.124 to my Barawa whitelist (from "Lists -> Add to List, added 126.96.36.199,) but the spamsnake is still trying to process this SPF Here is a log excerpt from my local BIND9 server showing the lookup: Code: Apr 13 13:06:57 vector named: client 192.168.66.13#43386: query: mail.senderdomain.com IN SPF + (192.168.66.14) Do I need to do something else to eliminate the SPF processing on whitelisted IP addresses? Respectfully, Dave, Deconn Technical Services.