/usr/sbin/ is in sendmail-base 8.14.4-8+deb8u2.
This file is owned by root:root, with mode 0o755.
| File | Mime Type | Owner | Mode | Size | 
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    /usr/sbin/sendmailconfig
    
        
    
                 | 
                text/x-shellscript | root:root | 0o755 | 21.2 KB | 
                    
    
        
    
    
    /usr/sbin/etrn
    
        
    
                 | 
                text/x-perl | root:root | 0o755 | 4.3 KB | 
                    
    
        
    
    
    /usr/sbin/checksendmail
    
        
    
                 | 
                text/x-perl | root:root | 0o755 | 23.0 KB |