On 12/05/2017 01:17 AM, Colony.three wrote: >> Looks like it's doing what it's supposed to, but just checking... >> >> What do you think it's supposed to be happening below? Those are just >> normal hacking attempts from China to do SMTP authentication to try to >> abuse your server by sending spam through it. >> >> The warnings are normal when Postfix can't look up a matching A record >> from the PTR record content -- FCrDNS. This will cause the "unknown" in >> the Received header and SA rule hit on RDNS_NONE if the connection makes >> it far enough.
That is what I was hoping is going on. I have never done this before, so wanted to check to make sure. In my case I don't have control over my PTR record though, as my mail servers are on a hosted OpenStack instance. I do though have DNSSEC, DKIM, and DNAE working for my mail servers. I hope those help.
