Fix out-of-bounds error when incorporating email from stdin

[mmh] / etc / scan.size

%4(msg)%<(cur)+%| %>%<{replied}-%| %>\
%02(mon{date})/%02(mday{date})%<{date} %|*%>\
%5(size) \
%<(mymbox{from})%<{to}To:%14(decode(friendly{to}))%>%>\
%<(zero)%17(decode(friendly{from}))%>  \
%(decode{subject})