Patches from Melchior Franz:

Patches from Melchior Franz:

  - define buffers where they are needed (two places)
  - comment out stale debug message (it doesn't buy anything, because the
    contents are output two lines below, anyway)
  - let every error message begin with "ERR ". This makes error messages
    less beautiful, but easier to recognize for scripts. Every internet
    protocol that outputs text, has such a tag for distinguishing regular
    output from error messages. (pop3 uses "-ERR ", smtp uses error codes,
    etc.)