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Unique Email Address in Mysql

I have a big mail database but there are some dublicate email addresses. I need unique email address lists and i follow this way;

Firstly i create temporary table for unique email address

CREATE  TABLE  mail_temp (  `email` varchar( 255  )  NOT  NULL default  ''

) ENGINE  =  MyISAM;

After i add unique email address to that temp table

INSERT INTO mail_temp SELECT DISTINCT(email) FROM mail_table

I dropped my real email table

DROP TABLE mail_table;

After all, i create new mail table and moved the temporary mail table to in.

CREATE TABLE mail_table( `email` varchar( 255 ) NOT NULL default ''
) ENGINE  = MyISAM;

INSERT INTO mail_table SELECT  DISTINCT(email) FROM mail_temp;

DROP TABLE mail_temp;