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  1. #1
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    On a blacklist because of a neigbouring IP???

    I have a site hosted on a dedicated IP XX.XX.XX.82

    I have noticed that my IP is now on the blacklist of www.spamcannibal.org . Having checked, I see that the reason for blacklisting my IP is that IP XX.XX.XX.124 had sent some spam.

    Is that normal???

  2. #2
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    Yup it happens. If the blacklist has a removal process, I'd use it if you're able to, otherwise ask your DC /host to do it. If tis one of those stubborn lists then I suppose you could ignore it unless it causes issues.
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  3. #3
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    It looks like spamcannibal will keep blocking me unless I add a "unique reverse pointer" PTR record to my IP: 1 2 . ... but my IP is not used at all for mail, whether inbound or outbound! And what is the PTR record I should add?

  4. #4
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    Add a rDNS entry by asking your host to set your ip or ips to something.yourdomain.com (usually your hostname )
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  5. #5
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    So in my case www.my_domain.com would be correct?

    Or maybe something like this.domain.does.not.send.mail.my_domain.com ?

  6. #6
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    Yeah if you want. You can put whatever you want for it as long as its in that format.
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  7. #7
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    Quote Originally Posted by kiwipole View Post
    It looks like spamcannibal will keep blocking me unless I add a "unique reverse pointer" PTR record to my IP: 1 2 . ... but my IP is not used at all for mail, whether inbound or outbound! And what is the PTR record I should add?
    In the DNS zone for yourcompany.com, you would have a record like this:
    Code:
    pluto IN A 1.2.3.82
    Your host would then have a reverse DNS entry in their 3.2.1.in-addr.arpa zone:
    Code:
    82 IN PTR pluto.yourdomain.com.
    So when someone does a reverse lookup for 1.2.3.82, it will point to pluto.yourdomain.com. When they then do the forward lookup on pluto.yourdomain.com, they see the same IP, which is how they verify it.

    If you also use other names for your IP, that's ok. They just want to see that a reverse lookup returns some name, and that that name resolves back to the IP.
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  8. #8
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    or check.spf.my_domain.com ?

  9. #9
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    Quote Originally Posted by bqinternet View Post
    In the DNS zone for yourcompany.com, you would have a record like this:
    Code:
    pluto IN A 1.2.3.82
    Thanks Scott; that looks like good advice Does that mean, in other terms, pointing the A record to pluto.my_domain.com ?

  10. #10
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    Quote Originally Posted by kiwipole View Post
    Thanks Scott; that looks like good advice Does that mean, in other terms, pointing the A record to pluto.my_domain.com ?
    Sure. You can have many different A records for the same IP, but you can only have one reverse PTR.
    Scott Burns, President
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  11. #11
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    Quote Originally Posted by kiwipole View Post
    It looks like spamcannibal will keep blocking me unless I add a "unique reverse pointer" PTR record to my IP: 1 2 . ... but my IP is not used at all for mail, whether inbound or outbound! And what is the PTR record I should add?
    If the IP is not used for mail, then it doesn't matter whether it's blacklisted or not honestly. That isn't to say you shouldn't get it cleared if it's within your power.
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  12. #12
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    Quote Originally Posted by bqinternet View Post
    you can only have one reverse PTR.
    That's actually not true.
    I have several on several IP addresses.

    It just needs one. But it can have more.
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  13. #13
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    Having googled it, I now wonder if I should not simply point the PTR to my_domain.com

    It would seem that a PTR record also helps with email deliverability, and some providers actually demand one, e.g. AOL. Maybe this is why I have always had trouble delivering mail to AOL from all my domains? - I always thought that it does not matter, since I never use the hosting company's email service, but a specialised service like Tuffmail or Authsmtp and my SPF record just contains an "include"; but I am now wondering if AOL (and others) also check if my_domain.com also has a valid PTR record pointing to it?

    If that is the case, I may be able to solve both problems by pointing the PTR to my_domain.com ... or does it also have the potential to mess up? Whatcha think?

  14. #14
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    AOL is just a pain-in-the-butt ISP, period, PTR or not.

    What always aggravates me is that AOL is the source for a lot of spam.
    They over-restrict incoming policies, but half-@ss the outgoing policies? Really?!
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  15. #15
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    Aug 2005
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    oh come on this is not fair ? why does the OP has to suffer because one of his neighbours dedcided to start spamming.Innocent people should not be punisched however some of those blacklists just block the whole range .... In that case it should be enough contacting them "this is my ip and i am not a spammer".

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