Unobfuscate a Spammy Email

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Demonstrates the Chilkat Email.UnSpamify method, which unobfuscates an email by undoing common spammer tricks — it removes comments from HTML bodies and unobfuscates hyperlinked URLs. This example cleans an HTML body whose link was broken up by an inserted comment.

Background: Spammers deliberately scramble HTML to slip past filters — inserting empty comments in the middle of words or URLs (example.com), or otherwise obfuscating links — so the message renders normally to a human but confuses naive keyword matching. UnSpamify reverses those tricks, producing a normalized body that is easier to analyze, classify, or scan for the real destination of its links.

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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkEmail email;
    const char *cleaned;

    //  Demonstrates the UnSpamify method, which unobfuscates an email by undoing common spammer
    //  tricks: it removes comments from HTML bodies and unobfuscates hyperlinked URLs.

    email = CkEmail_Create();
    CkEmail_putSubject(email,"UnSpamify example");

    //  An HTML body with an obfuscating comment inserted into a hyperlink.
    CkEmail_SetHtmlBody(email,"<html><body>Visit <a href=\"http://exa<!--x-->mple.com\">our site</a>.</body></html>");

    //  Undo the obfuscation.
    CkEmail_UnSpamify(email);

    cleaned = CkEmail_getHtmlBody(email);
    printf("%s\n",cleaned);


    CkEmail_Dispose(email);

    }