SOLVED Reverse DNS does not match SMTP Banner

Layth

Member
May 17, 2018
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Hello , i have two domains on my server , i have one ip which is "162.144.xxx.xxx"
when i do test at mxtoolbox.com i get "Reverse DNS does not match SMTP Banner" for both domains , i dont understand where is the problem :(

Can you help me please!

thank you


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Layth

Member
May 17, 2018
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I have full access to root but i dont know how to apply it , i will ask my support to do it for me depends on solution that you referred .

Thank you very much
 

cPanelMichael

Administrator
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Apr 11, 2011
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Hello,

You may also want to verify the message isn't a false positive. Do you receive the same result from MXToolBox when temporarily disabling "Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam" in "WHM >> Exim Configuration Manager"?

Thank you.
 
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Layth

Member
May 17, 2018
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Russia
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Website Owner
Hello,

You may also want to verify the message isn't a false positive. Do you receive the same result from MXToolBox when temporarily disabling "Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam" in "WHM >> Exim Configuration Manager"?

Thank you.

Hello, i just disabled it and no more errors when do test at MXToolBox , should i keep it off ?

Thank you for help
 
Last edited:

cPanelMichael

Administrator
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Apr 11, 2011
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Hello, i just disabled it and no more errors when do test at MXToolBox , should i keep it off ?
No, I recommend leaving the option enabled since it's only leading to a false positive at the MXToolBox website. It's an issue with their website's test.

Thank you.
 

pradeep kumar

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Apr 14, 2021
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Hello , i have two domains on my server , i have one ip which is "157.36.xxxxxx"
when i do test at mxtoolbox.com i get "Reverse DNS does not match SMTP Banner" for both domains , i dont understand where is the problem :(

Can you help me please!

thank you
 

cPRex

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Oct 19, 2014
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@pradeep kumar - it's best to make a new thread for maximum visibility of your issues.

I would recommend running "dig -x 1.2.3.4" to manually check the reverse DNS, where "1.2.3.4" is your server's IP address. This will show you what is configured for the reverse DNS for that IP, which normally maps back to the hostname of the server, as that shows up in all email headers.