If you want to unsubscribe, two things you need to do:

1) address your email to listserv@mitvma.mit.edu, not
piclist@mitvma.mit.edu

2) fix your mail program, so it doesn't send html or rich text, or
whatever. Otherwise you might never get unsubscribed. This is what your
message looks like on my end:

Parts/attachments:
   1   OK    ~1 lines  Text (charset: ISO-8859-1)
   2        ~10 lines  Text (charset: ISO-8859-1)
----------------------------------------


  [Part 1, Text/PLAIN (charset: ISO-8859-1 "Latin 1")  1 lines]
  [Not Shown. Use the "V" command to view or save this part]


  [Part 2, Text/HTML (charset: ISO-8859-1 "Latin 1")  10 lines]
  [Cannot display this part. Press "V" then "S" to save in a file]