Set LANG to something other than "en_*" if you want to keep the original design, quoted-printable encoding, instead of this repository's preference, format=flowed. The patched mmime.c is best accompanied by adjustments in your editor to ensure that trailing whitespace is in the right place. For example, in ~/.vimrc: function! FixIndented() " remove spaces at end of indented lines silent! %s/^\s.*\zs \+$// endfunction function! TextFlowed() setl tw=72 setl fo+=w setl nojs setl nosmartindent setl list set listchars=trail:• endfunction autocmd BufRead,BufNewFile */sent/cur/* call TextFlowed() autocmd BufRead,BufWritePre */sent/cur/* call FixIndented()