Why the Spam?

Why is our group getting hammered with so much spam?  Is there
something we can collectively do?

Sorry, I needed to ask but to bring it back round to MS Access, I have
worked up an access database for a number of years and would like to
consider having it delivered as a web based solution.  I'm assuming it
needs to be upscaled to SQL or something- is this easy to do and
learn, or is it more a job for a commercial outfit?  thanks

David