MFS SERIES TRUST I, 497J, 1996-07-01

MFS SERIES TRUST I
497J, 1996-07-01

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                               MFS SERIES TRUST I
             500 BOYLSTON STREET o BOSTON o MASSACHUSETTS 02116-3741
                                 617 o 954-5000




                                            July 1, 1996




VIA EDGAR
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

         Re:  MFS Series Trust I (the "Trust") (File No. 33-7638), on behalf of
              MFS Equity Income Fund, MFS Research Growth and Income Fund, MFS
              Core Growth Fund, MFS Aggressive Growth Fund and MFS Special
              Opportunities Fund (series of MFS Series Trust I)

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please accept this letter as certification  that the Prospectus and Statement of
Additional  Information  for the individual  series of the Trust does not differ
from that contained in Post-Effective  Amendment No. 24 (the "Amendment") to the
Trust's   Registration   Statement  on  Form  N-1A.  This  Amendment  was  filed
electronically on June 27, 1996.

         Please call the undersigned or Sharon Julius-Doucette at (800) 343-2829
or (617) 954-5406 or with any questions you may have.

                                            Very truly yours,



                                            JAMES R. BORDEWICK, JR.
                                            James R. Bordewick, Jr.
                                            Assistant Secretary

JRB/bjn