Delete files older than a specific date and Time
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Suppose you want to delete files before 10 June 2014 , 09:50 AM
touch -t 201406100950 /tmp/timeref
Then
find . ! -newer /tmp/timeref -exec rm {} \;
This Command will delete all mail which are older than 10 June 2014 , 09:50 AM
Caution: Please Be aware of the Time Zone of The Server before deleting