Dnswl.org Recommendations

Improvements
1

So I just had myself added to the dnswl.org whitelist and I got this email from their administrator.

Does he/she make a good point? Is it fixable, or does it even need to be fixed?

(IP address chaged to xx and domain changed to domain)

Hi,

Completely beyond the scope of DNSWL though - but as the kind person I am
(usually), you’ll get a few suggestions:

While looking around, I spotted this:

$ host ns1.box.domain.com
ns1.box.domain.com has address xxx.xxx.xx.xxx
ns1.box.domain.com has IPv6 address xxxx:xxxx:x:xx:xxx:8001

$ host ns2.box.domain.com
ns2.box.domain.com has address xxx.xxx.xx.xxx
ns2.box.domain.com has IPv6 address xxxx:xxxx:x:xx:xxx:8001

… That is a serious mistake. There is a reason >at least< two DNS servers are
required.

Also,

$ telnet xxx.xxx.xx.xxx 25
Trying xxx.xxx.xx.xxx…
Connected to xxx.xxx.xx.xxx.
Escape character is ‘^]’.
220 box.domain.com ESMTP Hi, I’m a Mail-in-a-Box (Ubuntu/Postfix; see
https://mailinabox.email/)

As your mail server tells everyone “Hi. My name is box.domain.com”, you
should also consider using that host name as a PTR<->A for your FcRDNS.

All that being said, you have been listed under the DNSWL ID #41867.

–
Kind regards,
John Smith

2

In 15 years of running my own mail server I have (almost) never had two nameservers. I don’t know what he’s thinking.

you should also consider using that host name as a PTR<->A for your FcRDNS

That’s true, but you should have that working already or the status checks would be telling you reverse dns isn’t set up.

3

(I’m concerned I may sound a little snarky there. Not intended.)

4

Hey @JoshData,

I think I’ll go with your expertise here.

Also, I did notice that a couple of weeks ago, I received a status email saying my reverse DNS does not resolve to my IP, but then without my even making any changes the issue seemed to be resolved. I don’t see any warnings on the status page. Not sure what’s going on there.

5

It’s probably just a temporary network glitch. I get that too from time to time.