You can retrieve this information using a SQL query. Here's how:
The Query:
SELECT
O.ID,
O.FULLNAME,
R.ACTION1ID->FULLNAME
FROM
CALARMREDIRECTIONLIST AS R
JOIN
CDBOBJECT AS O ON R.ID = O.ID
WHERE
R.ACTION1ID = 5347 -- Replace 5347 with the actual Email Action ID
ORDER BY
"FullName" ASC
Note: As per the highlighted section above, replace the number 5347 with the object ID number of the email action object.