Invalid ptr/dns... listed in spamcannibal

Posted on 2011-10-17
Last Modified: 2014-06-26
Hello, i have a vps server in my business.  
Our email , today , is going out perfectly.   But somedays not.

We are listed in spammcanibal:

Click for WhoisIP:  ES    
        spam source, anonymous/un-named IP

Our server ip :
domain related about:

Our host in hosting has name:

When i try to remove our address from spamcannibal i get:

" not eligible for removal: GENERIC PTR
Why are you listed?
Fix these problems before asking for removal from our database.

Your host sends spam.

My dns configuracion for this domains are:

SMTP test in mxtoolbox shows:

 OK - resolves to
 OK - Reverse DNS matches SMTP Banner
 0 seconds - Good on Connection time
 Not an open relay.
 2.387 seconds - Good on Transaction time

Session Transcript:
250 [140 ms]
250 ok [1154 ms]
553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) [140 ms]
221 [140 ms]

All apears ok, i would like to be removed from spamcannibal to get less problems sending emails...

If someone can help me, I'll be very grateful.
I have plesk in my vps.

Question by:jarizaro
    LVL 23

    Accepted Solution

    OK - I think I can see where things are going wrong here - it's all to do with using the hostnames that your hosting provider is using.  Anything in that IP range with the same DNS suffix is being grouped together.

    The DNS for and rDNS are point to the internal name for HOSTYTEC.COM.

    What you need to do is as follows: -

    1. create a DNS entry for your e-mail server that is specific to your domain - i.e. with the IP address of  You will also need to have  the rDNS entry created as well.
    2. Update your e-mail server to send the DNS name

    I think doing that should allow you to get your IP off the spam lists.

    Author Comment

    Thanks jakethecatuk,

    I think i have these entries ok in my dns config... a attach a screenshot about dns configuration for this domain..

    LVL 23

    Assisted Solution

    OK - you now need to get your hosting company to create the rDNS entry to complete everything.  Once that's been done and MXTOOLBOX is happy, then you can go back to spamcannibal to get yourself removed from their spam list.
    LVL 21

    Expert Comment

    Interesting I have never seen that type of spam block before.

    Couple things to add -
    Your SPF record has the mechanisms "a" and "mx", which both resolve to your IP.  Not only is that redundant, but it requires 3 additional DNS lookups per SPF check, which all resolve to the same thing :)

    The best practice for your SPF record is
    "v=spf1 ip4: ~all"

    Open in new window


    Author Comment

    Hello again, sorry by my delayed response.

      Can i create that rdns entry in the upper table ?
      I'm using plesk on vps.

     Thanks by your tip.  I'll try that later when i get move out from spamcannibal..
    LVL 23

    Expert Comment

    unlikley that you can create your own rDNS record.  that is normally completed by your ISP as they own that part of DNS.

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