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2 Email Address Check Rules and Security

    2.1	Level of address check severity

    When fml.pl compares From: address and an address in member lists,
    fml.pl recognizes the following four addresses as the same one in
    default. That is fml.pl checks within three levels from DNS root.

    	fukachan@titech.ac.jp
    	fukachan@phys.titech.ac.jp
    	fukachan@beth.phys.titech.ac.jp
    	fukachan@exelion.phys.titech.ac.jp

    If you check domains more severely, the levels from DNS root is
    controlled by $ADDR_CHECK_MAX. If you check 4 levels, set up

    	$ADDR_CHECK_MAX = 4;

    If 4,

    	fukachan@phys.titech.ac.jp
    	fukachan@beth.phys.titech.ac.jp
    	fukachan@exelion.phys.titech.ac.jp

    is the same but

    	fukachan@titech.ac.jp

    differs from others.

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