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DNS and Email HELO

Discussion in 'Bind / DNS / Nameserver Issues' started by bmcpanel, Jul 12, 2006.

  1. bmcpanel

    bmcpanel Well-Known Member

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    When I run a dns check at www.dnsreport.com on any of our Cpanel domain names, I always notice the following error message....

    WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

    myfakecustomer.com claims to be host ns.myfakeserver.net [but that host is at 207.55.55.55 (may be cached), not 207.55.55.101].


    Whereas, 207.55.55.55 is the ns1 IP #
    &
    Whereas, 207.55.55.101 is the IP associated with the customer's domain name

    So, since a reverse dns check will show the customer's IP #, and not the IP # that is reported by the email in the HELO section of the header, some companies will catch these emails in their spam filter (Comcast is one of them).

    Is it possible to make the HELO in an email match a reverse lookup on a customer's email?
    The HELO is currently the server IP # and a receiving server's reverse lookup will show the account IP #. (Consider that a customer has a dedicated IP, for example.).
     
  2. katmai

    katmai Well-Known Member

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    having the same problem here. i would like to know more about this issue as well
     
  3. docenta

    docenta Well-Known Member

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    yes I have the same problem with site running on Dedicated IP> :)




    Thanks.
     
  4. RickG

    RickG Well-Known Member

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    Take a look at the DNS Zone file for the account in question through WHM. When you created / moved the account to a dedicated IP more than likely the "mail" entry reflects the dedicated IP address of the account - it needs to point to the main server IP address. If needed, compare the value to zone entries of accounts not on a dedicated IPs. Make the correction, re-run the DNSReport and the error should disappear.
     
    MaraBlue likes this.
  5. katmai

    katmai Well-Known Member

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    what we mean is that we'd love to be able to send mails from user@domain.com using the domain.com ip address not the server main ip address, because it often gets blacklisted and we get customers going crazy.
     
  6. RickG

    RickG Well-Known Member

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    Understood, but unfortunately, it is not possible. You can change the IP used for all outgoing mail (from the server default), but it can not be set per account (even if the account has been allocated a dedicated IP).

    There are lots of threads on this. Try a search using the words: mail dedicated IP if you need more of an explanation as to why the system was not designed for this.
     
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