See the current "moose loose" thread.

It appears that when posting on Google Groups, anything enclosed in square
brackets is deleted (I assume and hope just from the header) so that
prefixes such as [OBS] and [WR] do not show.

However prefixes in round brackets - (OBS) or (WR) for example - are
unaffected and so posters obliged to use Google Groups for their posts and
who wish to use prefixes to identify the nature of the posts should use the
round brackets.

Best regards, Roger