[from book-of-the-month club
, a time-honored
mail-order-marketing technique in the U.S.] A mythical club which users of
sendmail8 (the Unix mail daemon)
belong to; this was coined on the Usenet newsgroup comp.security.unix at a
time when sendmail security holes, which allowed outside
crackers access to the system, were being uncovered
at an alarming rate, forcing sysadmins to update very often. Also, more
completely, fatal security bug-of-the-month
club. See also
kernel-of-the-week club.