[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] [Y] [Z] Venema, Wietse  2nd  VERB, SMTP command  VeriSign  2nd  version, BIND global option  view{} statements in named.conf file      match-clients  virtual domains and Sendmail  Virtual Private Networking  [See VPN] virtual server setup     ProFTPD, in  virtusers  virus scanners  Vision, Max  Vixie, Paul  VLAD  VPN (Virtual Private Networking)      tools, Free S/WAN  VRFY, SMTP command  vulnerabilities      attackers scanning ranges of IP addresses for      daemon      DNS      frequently targeted      mitigation of      Sendmail  VulnWatch