HELO
After not receiving the shipping notification for something I received last night, I have decided to try disabling Postfix’s HELO validations on my server. This will likely lead to far more spam being delivered, but it should eliminate odd rejections from non-compliant servers.
I had smtpd_helo_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname set, which can be referenced here. The problem was some sites wouldn’t send a proper HELO, leading to mail not being delivered as it should have been. Maybe it’d be best to have a SA rule which marks down improper HELOs instead of simply blocking them.
If spam levels get too high again, maybe I’ll go back to the old restrictions. They generally work fine.




