I did it via phpMyAdmin with the "LIKE" function, so using SQL queries like this:
DELETE FROM et_member WHERE email LIKE '%.ie%'
OR
email like '%.pw%'
OR
email like '%.ua%'
OR
email like '%.pl%'
OR
email like '%.vn%'
OR
email like '%.xyz%'
OR
email like '%.directory%'
Ok, finished. Now I'll try to import it on a Flarum local install to see what's happen.