Sergio Belkin: > Some information about my software that may be useful: > libc-2.17-260.el7_6.4.x86_64 > glibc-2.17-260.el7_6.4.i686 > dnsmasq-2.76-7.el7.x86_64
Are you running a RHEL port of Postfix 2.10? They sometimes back-port
features from a later Postfix release. The Postfix code that handles
DNS errors is very careful about giving 'try again' errors precedence
over 'hard' errors, and it is very easy to screw that up.
Does it have the Postfix 3.0 smtp_dns_reply_filter feature?
Wietse
