Write SQL query to solve given problem: What is the most common domain for the email address among all the customers?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUBSTR(email, INSTR(email, '@') + 1, LENGTH(email) - INSTR(email, '@')) AS ym FROM customer GROUP BY SUBSTR(email, INSTR(email, '@') + 1, LENGTH(email) - INSTR(email, '@')) ORDER BY COUNT(*) DESC LIMIT 1