Even more spam in the last 24 hours - what gives?

Over the last 24 hours, spam has, once again, increased exponentially. I am receiving more spam than valid emails. I am also having a bit of a lag on incoming emails and receive an error message occasionally when I send emails. I have already switched to Firefox as IE is not currently compatible with the email. Is there ANYTHING I can do to help decrease the amount of spam I am receiving? Do you have any idea when your spam filtering will be back up to standard? Thanks.