vim/.vim/plugin/killsig.vim

   1 function! s:KillSignature()
   2     call cursor(1, 1)
   3     call search('^[>|] \?-- \?$')
   4     if getpos(".")[1] != 1
   5         normal d}
   6     endif
   7 endfunction
   8
   9 autocmd BufRead /tmp/mutt-* call s:KillSignature()