Table schema:
CREATE TABLE table_name_21 (goals_against INTEGER, position VARCHAR, points VARCHAR, club VARCHAR)

Question: What is the highest Goals Against, when Points is greater than 25, when Club is "SD Indautxu", and when Position is greater than 3?
SQL: SELECT MAX(goals_against) FROM table_name_21 WHERE points > 25 AND club = "sd indautxu" AND position > 3