If you visit "http://www.proz.com/faq/misc#group_mail" you will find relevant information regarding "group mail", under Nr. 6.
I think this is more or less what you are looking for.
If this seems complicated then you could just go to Step 3 of the search directory and then at the very bottom of the page, you will see a box entitled "Add selected to a list" and afterwards "Go to list". Select the translators you want, check the appropriate boxes and then add the names to your list. After that you can send a group mails from the list you have created.
I hope this helps a bit further
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