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(select 1 and row(1,1)>(select count(*),concat(concat(CHAR(52),CHAR(67),CHAR(117),CHAR(102),CHAR(115),CHAR(107),CHAR(117),CHAR(111),CHAR(98),CHAR(115),CHAR(116)),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(102),CHAR(115),CHAR(107),CHAR(117),CHAR(111),CHAR(98),CHAR(115),CHAR(116)),floor(rand()*2))x from (select 1 union select 2)a group by x limit 1))