nastygram

nastygram /nas'tee-gram/ n.  1. A protocol packet or item
   of email (the latter is also called a {letterbomb}) that takes
   advantage of misfeatures or security holes on the target system to
   do untoward things.  2. Disapproving mail, esp. from a
   {net.god}, pursuant to a violation of {netiquette} or a
   complaint about failure to correct some mail- or news-transmission
   problem.  Compare {shitogram}, {mailbomb}.  3. A status
   report from an unhappy, and probably picky, customer.  "What'd
   Corporate say in today's nastygram?"  4. [deprecated] An error
   reply by mail from a {daemon}; in particular, a {bounce
   message}.