Xtra's (dismal) spam filter performance continues.

Discussion in 'NZ Computing' started by PC, Mar 10, 2006.

  1. PC

    PC Guest

    Greetings all.

    Cleared out an Xtra email account I monitor today after leaving it for a few
    weeks.

    The 'Inbox' contained 633 Spam emails, the 'Spam' folder contained 216
    emails.
    Total of 849 Spam emails received to this account for the period 14 Feb - 8
    Mar 06

    Detection rate = 25.4%
    (best detection rate to date was around 50%)

    It should be noted this is after reporting 11,000 + Spam emails from the
    'same' sources with the same type of content over the last 12 months

    Cheers
    Paul.
    PC, Mar 10, 2006
    #1
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  2. PC

    Dave Taylor Guest

    "PC" <> wrote in
    news:e56Qf.5214$:

    >
    >
    > It should be noted this is after reporting 11,000 + Spam emails from
    > the 'same' sources with the same type of content over the last 12
    > months
    >
    > Cheers
    > Paul.
    >
    >
    >


    If you control the mx record then I recommend the following service:
    http://www.caledonia.net/iris.html

    --
    Ciao, Dave
    Dave Taylor, Mar 11, 2006
    #2
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  3. Re: Xtra's (dismal) spam filter performance continues.

    PC wrote:

    > Cleared out an Xtra email account I monitor today after leaving it for a few
    > weeks.
    >
    > The 'Inbox' contained 633 Spam emails, the 'Spam' folder contained 216
    > emails.
    > Total of 849 Spam emails received to this account for the period 14 Feb - 8
    > Mar 06
    >
    > Detection rate = 25.4%
    > (best detection rate to date was around 50%)


    But did any genuine mail get trapped by the spam filters? I don't think
    that the spam detection rate alone is a meaningful measure, because you
    also need to look at the number of genuine emails trapped as a
    proportion of spam messages not trapped. For example, a spam filter
    with a 99% detection rate isn't much good if it also traps 50% of your
    genuine mail.

    Note that I'm not defending Xtra here, since their filters seem to have
    chronic problems with trapping genuine mail.
    alastair.geek.nz, Mar 11, 2006
    #3
  4. PC

    PC Guest

    Re: Xtra's (dismal) spam filter performance continues.

    "alastair.geek.nz" <> wrote in message
    news:...
    > PC wrote:
    >
    >> Cleared out an Xtra email account I monitor today after leaving it for a
    >> few
    >> weeks.
    >>
    >> The 'Inbox' contained 633 Spam emails, the 'Spam' folder contained 216
    >> emails.
    >> Total of 849 Spam emails received to this account for the period 14
    >> Feb - 8
    >> Mar 06
    >>
    >> Detection rate = 25.4%
    >> (best detection rate to date was around 50%)

    >
    > But did any genuine mail get trapped by the spam filters? I don't think
    > that the spam detection rate alone is a meaningful measure, because you
    > also need to look at the number of genuine emails trapped as a
    > proportion of spam messages not trapped. For example, a spam filter
    > with a 99% detection rate isn't much good if it also traps 50% of your
    > genuine mail.
    >
    > Note that I'm not defending Xtra here, since their filters seem to have
    > chronic problems with trapping genuine mail.



    Hi Alistar

    It would be unfair to blame Xtra for the difficulties involved with
    recognising Spam, it is as we all know an international problem.

    My grumble is, that despite the (now) 12,000 reports I've sent, Xtra's Spam
    reporting system is consistently failing to respond.

    The account in question is not being used as a regular email address because
    of this spam problem so does not really have any problem with false
    positive's.
    The only other emails the account received over that period were 2 'Max
    Newman' newsletters and approximately 15 'your mailbox is full' messages
    from Xtra' all of which were recognised correctly.
    It should be noted the 'Spam' sources are always the same and that they are
    all decidedly UCE (Unsolicited Commercial Email) with lots of 'sales'
    messages.


    Cheers
    Paul.
    PC, Mar 11, 2006
    #4
  5. PC

    Vista Guest

    "PC" <> wrote in message
    news:e56Qf.5214$...
    > Greetings all.
    >
    > Cleared out an Xtra email account I monitor today after leaving it for a
    > few weeks.
    >
    > The 'Inbox' contained 633 Spam emails, the 'Spam' folder contained 216
    > emails.
    > Total of 849 Spam emails received to this account for the period 14 Feb -
    > 8 Mar 06
    >
    > Detection rate = 25.4%
    > (best detection rate to date was around 50%)
    >
    > It should be noted this is after reporting 11,000 + Spam emails from the
    > 'same' sources with the same type of content over the last 12 months
    >
    > Cheers
    > Paul.
    >


    It seemed to be working ok for a few weeks, until the end of last week. Now
    I am getting bombarded with spam again.
    Vista, Mar 12, 2006
    #5
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