POWER OF ATTORNEY

The undersigned on his or her own behalf and on behalf of his or her estate,
heirs and assigns hereby constitutes and appoints Susan S. Newton, Christopher
R. Bohane, Timothy M. Fagan, Susan A. Pereira and Brian E. Langenfeld and each
of them singly as true and lawful attorneys with full power to them and each of
them, to execute, on behalf of the undersigned, in the capacity listed below,
any and all statements or reports under Section 16 of the Securities Exchange
Act of 1934, as amended, with respect to the beneficial ownership of reportable
securities issued by MFS Charter Income Trust, MFS Government Markets Income
Trust, MFS Intermediate Income Trust, MFS Multimarket Income Trust, MFS
Municipal Income Trust, MFS Special Value Income Trust, MFS California Insured
Municipal Fund, MFS High Income Municipal Trust, MFS InterMarket Income Trust
I, MFS Intermediate High Income Fund, MFS Investment Grade Municipal Trust and
MFS High Yield Municipal Trust including, without limitation, all initial
statements of beneficial ownership on Form 3, all statements of changes of
beneficial ownership on Form 4 and all annual statements of beneficial
ownership on Form 5, and any and all other documents that may be required, from
time to time, to be filed with the Securities and Exchange Commission, to
execute any and all amendments or supplements to any such statements or forms,
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting to
said attorney, full power and authority to do so and perform each and every act
and thing requisite and necessary to be done in and about the premises, as
fully to all intents and purposes as the undersigned (or his or her estate,
heirs and assigns) might or could do in person, hereby ratifying and confirming
all that said attorneys or any of them may lawfully do or cause to be done by
virtue hereof.

IN WITNESS WHEREOF, the undersigned has set his or her hand on this
______ day of __________, 2007.

________________________________
Kevin Dougherty