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w class  2nd 
w delivery agent flag 
W= delivery agent equate 
warning messages, severity level and  2nd 
whitespace
    blank line at end of message 
    continuation lines and 
    in macros 
    replacing in database keys 
    in sendmail.cf file 
    space character and 
wildcard MX records 
wildcard operators 
    positional operators and 
WILDCARD_SHELL compile-time macro 
workspace 
wrong symbolic link