[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] 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