Objective-C

Unobfuscate a Spammy Email

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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Objective-C

#import <CkoEmail.h>
#import <NSString.h>

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

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"UnSpamify example";

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

//  Undo the obfuscation.
[email UnSpamify];

NSString *cleaned = [email GetHtmlBody];
NSLog(@"%@",cleaned);