" Commands to delete a quoted message's signature and go into insert mode:
nmap <buffer> <LocalLeader>r }?^>\ *.<CR>?^>\ *$<CR>?^>\ *.<CR>jc}<CR>
nmap <buffer> <LocalLeader>R }c?^>\ -- $?<CR><C-U><C-U><CR>
nmap <buffer> <LocalLeader>z v/^-- <CR>dzbO<CR><CR><Up>