-unset MHBUILD MHCONTEXT MHMTSUSERCONF MHN MHSHOW MHSTORE
-unset MHLDEBUG MHPDEBUG MHWDEBUG MM_CHARSET PAGER
+unset MAILDROP MHBUILD MHCONTEXT MHMTSUSERCONF MHN MHSHOW MHSTORE
+unset MHLDEBUG MHPDEBUG MHWDEBUG PAGER
+#### Set LC_ALL in individual tests as needed. Unset these so
+#### that we don't depend on user's settings in other tests.
+unset LANG LC_ALL LC_CTYPE