OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has revised the outlook to negative from stable and affirmed the financial strength rating of A+ (Superior) and the issuer credit rating of “aa-” of The Savings Bank Life Insurance Company of Massachusetts (SBLI-MA) (Woburn, MA). The ratings of SBLI-MA reflect its leading position as a low-cost term life insurance provider, the benefits it derives from its well-recognized brand name in Massachusetts, favorable risk-adjusted capitalization and high quali