I'm using Postfix and this all that was needed: /etc/hosts 1.2.3.4 example.com
/etc/postfix/main.cf disable_dns_lookups = yes smtp_host_lookup = native
I'm using Postfix and this all that was needed: /etc/hosts 1.2.3.4 example.com
/etc/postfix/main.cf disable_dns_lookups = yes smtp_host_lookup = native