On 6/25/24 09:13, Carl Zwanzig wrote:
Just to be sure, I would try your host's name in one of the DNS/email test pages, such as
https://mxtoolbox.com/emailhealth/ (there are others).
Thanks Carl, a very good resource.
I put in compute.nomekennelclub.com and it shows nomekennelclub.com in the
results.
I gave me several warnings. Zero Errors
1. DNS: Names servers on the same subnet
2. SMTP: Reverse DNS doesn't match SMTP Banner (The SMTP banner issued by your email server did not contain the hostname
we resolved for your server’s IP address.)
3. SMTP: Does not support TLS
4. SMTP: 15.209 seconds - Not good! on Transaction Time
Reading up on this, the transaction time can cause warnings for reverse DNS and or TLS support. I did add TLSv1.3 into
the Apache global config and rebuilt/restarted Apache, but still get that same warning.
As for #1 - name servers.. I don't think that is contributing to the mail
rejections.
#2 - Reverse DNS - I have PTR records set for both compute.nkc.com
(abbreviated) and nkc.com. So that could be a problem?
#3 - TLS - not sure what more I can do there
#4 - transaction time.. ? Not sure I have control over that.. but one thing I googled reported that one could "Introduce
a delay into the SMTP transaction for unknown hosts and messages detected as spam" in Exim. Don't know about that.
/jd
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