Increasing Email Space Allotment SPAM

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I have a reseller's acct. The space alloted fills up every few days due to SPAM. How do I increase the space allotment of the email associated w/ one of my accts? I've got the SPAM filtered from the client/local side but, need the quick fix of increasing capacity until I have the time to set-up the server side filtering.(I don't think that theSPAM filter bundled w/ c-panel allows export of current Mac Mail client filtering rules.) I have, more than, adequate space and b/w w/ the acct for my needs- just need to convert some of it to email. Tx