Intermedia software inspects email message and determines the probability of that message being spam. You can configure your account mail filter to put a special identifier X-Spam-Status to the header area of the message, which can be used as a filtering mechanism for in your email system.

Using a rule base and scoring system, a wide range of heuristic tests are performed on the mail headers and body text. For an in depth list of spam tests performed on an email message see SpamAssasin site.

Each test has a specified score associated with it. If the total score of the message exceeds the mail filter sensetivity level and you have an Just add '[SPAM]' prefix to Subject for spam messages and still deliver to mailboxes option in Mail Server > SpamStopper page of your HostPilot, than every email message that is considered as spam is tagged with the [SPAM] prefix in the subject field and special identifiers in the header. Note that Basic spam filtering option has a predifined sensitivity level set to "3" and to change it you may need to switch to Advanced SpamStopper mail filtering solution.

The X-Spam-Status identifier includes: the successful spam tests identified, the email message total score or hits and the mail filter sensetivity level value.

  • Header example #1, where the message is not spam:

    To: <user@intermedia.net>
    Subject: Regular Email
    Date: Wed, 26 Feb 2009 14:05:47 -0800
    MIME-Version: 1.0
    Content-Type: multipart/alternative;
    boundary="----=_NextPart_000_0040_01C2DDA0.292F5970"
    X-Priority: 3
    X-Mailer: Microsoft Outlook Express 6.00.2800.1106
    X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
    X-Spam-Status: No, hits=1.3 tagged_above=-999.0 required=3, tests=[BAYES_20, HTML_70_80, HTML_MESSAGE]
  • Header example #2, where the message is spam:

    To: <user@intermedia.net>
    Subject: Spam Email
    Date: Wed, 26 Feb 2009 14:01:16 -0800
    MIME-Version: 1.0
    Content-Type: multipart/related;
    type="multipart/alternative";
    boundary="----=_NextPart_000_002D_01C2DD9F.876C8590"
    X-Priority: 3
    X-Mailer: Microsoft Outlook Express 6.00.2800.1106
    X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
    X-Spam-Status: Yes, hits=10.6 tagged_above=-999.0 required=7.0 tests=[BAYES_56,
    CLICK_BELOW, EXCUSE_10, EXCUSE_14, EXCUSE_22, EXCUSE_23, EXCUSE_24,
    EXTRA_MPART_TYPE, HTML_60_70, HTML_COMMENT_SAVED_URL, HTML_FONT_COLOR_BLUE,
    HTML_LINK_CLICK_HERE, HTML_MESSAGE, HTML_TAG_EXISTS_TBODY, MAILTO_LINK,
    OFFER, OFFERS_ETC, OPT_OUT, ORIGINAL_MESSAGE, RECEIVE_EMAIL, SMTPD_IN_RCVD]

In the spam message header you may also find X-Spam-Flag and X-Spam-Score identifiers that duplicate the X-Spam-Status field and can be used to configure the mail client rules to sort the spam messages to a separate folders.