How to disable double extension check

Edit file /etc/mailscaner/filename.rules.conf

# Deny all other double file extensions. This catches any hidden filenames.
allow	.[a-z][a-z0-9]{2,3}s*.[a-z0-9]{3}$	Found possible filename hiding		

and restart mailscanner /etc/rc.d/init.d/mailscanner restart		

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