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EEAA
EEAA
00:50
@Xalorous I'm beating a dead horse here, but apparently you're still not getting my initial concern. You keep saying that DNS records and open relays are related. They. Are. Not. Whether an SMTPd is an open relay or not is completely, 100% controlled by its configuration. The SMTP server's configuration. Not DNS records.
 
3 hours later…
EEAA
EEAA
03:49
I think here is where you're getting things confused: when a server receives mail from another system, it can optionally check DNS records (along with mail content, IP reputation, blacklists, etc) to determine the likelihood that the message is spam.
This has nothing to do with whether or not it is configured as an open relay. Anyway, I sincerely hope that you're able to take this information and internalize it. You'll be a better sysadmin for it.
Honestly. I mean that with the best of intentions. I always appreciate when I'm called out on something, because it gives me a chance to better my skills. I hope you are able to do the same.

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