/usr/share/sendmail/cf/hack/ is in sendmail-cf 8.14.4-8+deb8u2.
This file is owned by root:root, with mode 0o755.
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    /usr/share/sendmail/cf/hack/cssubdomain.m4
    
        
    
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                text/plain | root:root | 0o644 | 843 bytes | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/debian_auth.m4
    
        
    
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                text/x-m4 | root:root | 0o644 | 2.0 KB | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/dnsblaccess.m4
    
        
    
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                text/x-m4 | root:root | 0o644 | 4.0 KB | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/msp_nullclient.m4
    
        
    
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                text/x-m4 | root:root | 0o644 | 3.7 KB | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/nodns.m4
    
        
    
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                text/plain | root:root | 0o644 | 676 bytes | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/spamtrap.m4
    
        
    
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                text/plain | root:root | 0o644 | 2.0 KB | 
                    
    
        
    
    
    /usr/share/sendmail/cf/hack/virthost_by_ip.m4
    
        
    
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                text/x-m4 | root:root | 0o644 | 3.4 KB |