Start a new thread with an informative subject line.  E.g.
SUBJECT:  Holocaust survivors: John SMITH of Odessa and Jane JONES of L'vov - please help in locating descendants
Message body: I am looking for help in locating anyone who knew or is descended from John SMITH of Odessa and Jane JONES of L'vov.  I have documents showing Mr SMITH emigrated to Israel and lived in Netanya; and further documents showing that .... 

Hope that helps.
Joyaa ANTARES.  Gold Coast, Queensland, Australia