San Diego-based St. Bernard Software, a provider of security products for the small and midsize business market, said Thursday that it has received a $4M credit facility from SVB Silicon Valley Bank. The deal includes a $2M revolving line of credit and a $2M term loan. St. Bernard Software is a provider of Internet email filtering services and appliances, used by businesses to filter out spam and other unwanted messages. The line replaces and existing $1.2M credit facility and will be used for working capital.