Issue cannot solve "Reverse DNS does not match SMTP Banner"

[Dennis Oppelt]

Hi

I do not know much about dns, I am new at this

and this is not a crucial issue, so if you cannot help me, that's ok.
Its only coming up as a warning in mxtoolbox.com
and I was trying to tweak all settings.

when I use a checker, I get this warning:

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Reverse DNS does not match SMTP Banner
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I read up on this but found nothing that I could use. I have plesk access as well as SSH
on a Linux server, (Plesk Onyx, 17.8.11)


someone on line said to do this:
Verify to have /var/qmail/control/me file in FQDN format [1].
Then, to avoid rDNS problem, set ptr record to resolv correctly this FQDN to mail server.

I checked that file, I did not change anything, but it shows that I have 1 banner that shows: server.higain.ca

------------------

on my main account server settings
these are my Reverse DNS settings:
(I notice that the IP addresses are actually written in reverse)


PTR 115.214.97.209.in-addr.arpa ns2.higain.ca
PTR 127.138.10.69.in-addr.arpa server.higain.ca
PTR 128.138.10.69.in-addr.arpa ns3.higain.ca

-----------------------

my primary domain is higain.ca


my backup server for email is: mail2.higain.ca
and points to: 209.97.214.115

and in the DNS zone for higain.ca

there is one only PTR record:
PTR: 69.10.138.127/24 higain.ca

-----------------------

my mail works fine
incoming and outgoing

some suggested this:

that you contact your ISP and ask them to setup a reverse (PTR) record that matches the hostname of your mail server.

___________________

I have no idea about that

it seems like I have an smtp banner for mail.higain.ca
but not for the reverse dns

anyway

if you have an idea on this , please let me know
I have no clue

I thought of maybe putting another PTR record in the DNS zone to solve this but I do not know what parameter entries to use?

Dennis

 

[IgorG]

When you connect to your mailserver mail.higain.ca you see server.higain.ca SMTP banner:

$ telnet mail.higain.ca 25
Trying 69.10.138.127...
Connected to mail.higain.ca.
Escape character is '^]'.
220 server.higain.ca ESMTP

Both hostnames are resolvable for the same IP address:

# dig +short server.higain.ca
69.10.138.127
# dig +short mail.higain.ca
69.10.138.127

But PTR record for this IP address is

# dig +short -x 69.10.138.127
server.higain.ca.

As result, you have this mismatch - "Reverse DNS does not match SMTP Banner"

 

[Dennis Oppelt]

thanks but I don't know how to fix,,
In the DNS zone for higain.ca:

my A record for mail.higain.ca points to 69.10.138.127


my A record for mail.higain.ca points to 209.97.214.115

the only PTR record there:

IP address: 69.10.138.127 / 24

value: 69.10.138.127


__

any idea how I should fix it?

thanks
Dennis