I was hoping that with the size of the group and the relative
inactivity (as mails are limited to requests and responses :)), we'd
escape the spammers' notice.
However, twas not to be, unfortunately.
I've removed the spammer from the group, deleted the message and have
set it so that all new members are moderated - i.e. all messages from
them need to be approved by me before they are sent to the group.
This won't affect current members, but it will mean that in future,
when someone joins I won't actually set their status to unmoderated
until they've posted an on topic post and proved that they aren't a
love and Thorntons' chocolates
unconsciousmind - www.unconsciousmind.co.uk