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Fixing DMARC & Reverse DNS does not match SMTP Banner

Discussion in 'Bind/DNS/Nameserver' started by mytpanel, Nov 4, 2017.

  1. mytpanel

    mytpanel Registered

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    Hi everyone!

    So I've learned a ton about SPF and other sending authorizations, but using mxtoolbox, I still have the following issues. The site is - Removed -

    Code:
    1 Error(s)
    Category Host Result
    [IMG] dmarc example.com DNS Record not found
    7 Warning(s)
    Category Host Result
    dns example.com SOA Serial Number Format is Invalid
     dns example.com SOA Expire Value out of recommended range
    smtp gmr-smtp-in.l.google.com Reverse DNS does not match SMTP Banner
    smtp alt1.gmr-smtp-in.l.google.com Reverse DNS does not match SMTP Banner
    smtp alt2.gmr-smtp-in.l.google.com Reverse DNS does not match SMTP Banner
    smtp alt3.gmr-smtp-in.l.google.com Reverse DNS does not match SMTP Banner
    smtp alt4.gmr-smtp-in.l.google.com Reverse DNS does not match SMTP Banner
    
    I've read on some threads that these "don't matter". That said, I'd like to still understand how to fix them.

    * I'm using Google DNS.
    * I'm using a third party mail relay, which is good for the SPF, everything works properly.
    * I have inbound emails forwarded directly through Google Domains to another email inbox.

    From what I understand:
    * The SOA warnings are built into the DNS server, and I likely do not have access to them unless I'm hosting my own DNS through cpanel.

    But what do I do to fix the dmarc & Reverse DNS?
     
    #1 mytpanel, Nov 4, 2017
    Last edited by a moderator: Nov 4, 2017
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

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    Hello,

    If the email and DNS is hosted on the cPanel server, you can setup the DMARC record using the "Add DMARC Record" instructions from the following document:

    Zone Editor - Documentation - cPanel Documentation

    The reverse DNS warnings appear to stem from Google. You won't be able to alter those records because they are controlled by Google as opposed to your cPanel server.

    Thank you.
     
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