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[MailScanner] Removing the ALT attribute for Web Bug images

Discussion in 'cPanel Developers' started by spiff06, Aug 30, 2006.

  1. spiff06

    spiff06 Well-Known Member

    Jan 17, 2004
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    With MailScanner, "Web bug from" warnings appear when a Web bug, i.e. a tiny 1x1 image is inserted in an HTML message, by which the sender attempts to know whether the recipient has read the email.

    Now, having a string of characters replace a 1x1 picture in a mail client which does not load the pictures (for example, Thunderbird), means the page formatting is broken. On the eBay message I just received, the Web bug warnings make the page unreadable. I could show the images (it's only a button click away...), but I thought it would make more sense to remove the ALT attribute from the IMG tag entirely.

    I've commented out a line in /usr/mailscanner/lib/MailScanner/

            # It's not in the whitelist, so zap it with insecticide!
            $output .= '<img src="' . $WebBugReplacement . '" width="' .
                       $attr->{'width'} .  '" height="' . $attr->{'height'} .
                       '" alt="';
    [COLOR="Red"]#        $output .= 'Web Bug from ' . $attr->{'src'} if $attr->{'src'};[/COLOR]
            $output .= '" />';
            $DisarmWebBugFound = 1;
            $DisarmDoneSomething{'web bug'} = 1;
    Is there anything wrong in doing this? Specifically, would a remote server deem an incoming message from my server more likely flaggable as spam if the ALT attributes are set to the empty string?

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