inc/class-Iac_Settings.php
public function validate( $request ) {

		if ( ! empty( $request[ 'send_by_bcc' ] ) && '1' === $request[ 'send_by_bcc' ] )
			$request[ 'send_by_bcc' ] = '1';
		else
			$request[ 'send_by_bcc' ] = '0';

		if ( ! empty( $request[ 'send_attachments' ] ) && '1' === $request[ 'send_attachments' ] )
			$request[ 'send_attachments' ] = '1';
		else
			$request[ 'send_attachments' ] = '0';

		return $request;
	}
public function validate( $request ) {

		if ( ! empty( $request[ 'send_by_bcc' ] ) && '1' === $request[ 'send_by_bcc' ] )
			$request[ 'send_by_bcc' ] = '1';
		else
			$request[ 'send_by_bcc' ] = '0';

		if ( ! empty( $request[ 'send_attachments' ] ) && '1' === $request[ 'send_attachments' ] )
			$request[ 'send_attachments' ] = '1';
		else
			$request[ 'send_attachments' ] = '0';

		return $request;
	}
validate the input

@param array $request
@return array