In-Reply-To: Message from %<{from}%{from}%?{sender}%{sender}%|%{return-path}%>\n\
of "%<(nodate{date})%{date}%|%(pretty{date})%>."\
%<{message-id} %{message-id}%>\n\
In-Reply-To: Message from %<{from}%{from}%?{sender}%{sender}%|%{return-path}%>\n\
of "%<(nodate{date})%{date}%|%(pretty{date})%>."\
%<{message-id} %{message-id}%>\n\