Hi I recently found Hardening Postfix for ISPConfig 3 after receiving large amounts of spam. I followed the installation steps for: Reverse DNS, (DNS PTR Record) SPF For Your Domain (DNS TXT Record) SPF Check For Postfix (Debian And Ubuntu) DNSBL (DNS Based Blacklist/Blocklist) And my spam dropped of nicely, but on investigating the mail warn: I found the following: warning: hostname mirojhbfgt.miro.co.za does not resolve to address 154.127.112.27 This is in fact a domain that I do need to accept mail from. I know that is stems from the following settings, but wondered if there was a wihitelist somewhere I could make an exception list? smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname
