%(void(localmbox))%(void(width))%(putaddr From: )
%(lit)%(formataddr{mail-followup-to})\
%<(nonnull)%(void(width))%(putaddr To: )\n\
+%(putaddr Mail-Followup-To: )\n\
%|\
%(lit)%(formataddr %<{mail-reply-to}%?{reply-to}%?{from}%?{sender}%?{return-path}%>)\
%<(nonnull)%(void(width))%(putaddr To: )\n%>\