1. Bounce when no rDNS (exim/postfix/sendmail/qmail - 2 second conf) Sometimes people don't have access to configure Reverse DNS (or PTR) as
ac via talk wrote: they are sending with a dynamic IP address. This isn't common but at least for GTALUG there are five or six people who host their email from their home on dynamic IP addresses. Enough mail servers require a reverse DNS to accept incoming messages
On 08/16/2017 08:40 AM, Myles Braithwaite 👾 via talk wrote: that running a mail server without a reverse DNS setup correctly will block you from lots of mail destinations. Years ago I learned this lesson the hard way. If all you care about is this mail list and a hand full of other locations then run your mail server from home with no reverse. If you can find a properly setup forwarder then you may be able to have that site resend your messages. Also lots of ISP's filter outbound smtp connections.
2. Use 10+ dnsbl with properly configured spamassasin (cache locally) - with 2 (or more, or less) points per dnsbl listing (five minutes copy & paste for exim/postfix) -> dnsbl from here: http://multirbl.valli.org/ I stopped using SpamAssasin a while ago. I know use Rspamd, Rmilter, and OpenDMARC. I found SpamAssasin was letting in way to much spam and required way to much knowledge to run properly. I have hated Spamassassin for years but I still use it. I will have to take a look at rspamd.
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