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Spamhaus & Mobile Broadband

  • 17-02-2014 3:32pm
    #1
    Professey Chin
    Registered Users, Registered Users 2 Posts: 51,054 ✭✭✭✭


    Wondering if anybody else has come across this recently.
    We had some complaints about mails not delivering to us and when we took a look they were being caught by our filter which checks the Spamhaus blacklists. These were normal mails from a variety of addresses (gmail, hotmail, outlook, yahoo etc) with nothing out of the ordinary.

    Checked things out and it seems that when its sent from a phone/3g dongle connection, the original IP gets written to the mail headers and this is being picked up as blacklisted. Today we've had 3 blocked mails relating to broadband providers(checked registrars with ipdb.at) and this has been apparently going on for a while.

    180.183.160.58 - Three Broadband Spamhaus


    213.233.148.11 - Vodafone Ireland Spamhaus


    95.83.249.151 - Telefonica O2 Spamhaus

    Would you say just a more common entry since a payg connection is easy to pick up and use maliciously with less traceability & the dynamic ips can push it onto a different customer?
    Wonder how many genuine customers it could affect with business mails especially since a lot of spam filters wouldnt give a notification of any kind.


Comments

  • #2
    Hotblack Desiato
    Registered Users, Registered Users 2 Posts: 35,759 ✭✭✭✭Hotblack Desiato


    Professey Chin wrote: »
    Would you say just a more common entry since a payg connection is easy to pick up and use maliciously with less traceability & the dynamic ips can push it onto a different customer?

    Don't the networks NAT all their mobile broadband users through one IP? (or, at least, a very small number of IPs?)

    Scrap the cap!



  • #3
    Professey Chin
    Registered Users, Registered Users 2 Posts: 51,054 ✭✭✭✭Professey Chin


    ninja900 wrote: »
    Don't the networks NAT all their mobile broadband users through one IP? (or, at least, a very small number of IPs?)
    Sorry yep. That was my mistake. They all have a small pool of public facing IPs so everything is NAT through though.
    It seems to be the public ones getting caught though.


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