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4 Relaying based on RFC821

    Today we cannot permit relaying against spam mails. If sendmail is not
    found, FML tries to use qmail-smtpd, exim.

    4.1	Relay Configurations In Actives File

    When you can use relay server (here axion.phys.titech.ac.jp), You can
    write how to relay in "actives" file,

    	fukachan@phys.titech.ac.jp	r=axion.phys.titech.ac.jp

    	address				relay server
    	fukachan@phys.titech.ac.jp	r=axion.phys.titech.ac.jp

    FML interprets, rewrite and injects this to sendmail as:

    	@axion.phys.titech.ac.jp:fukachan@phys.titech.ac.jp

    If "actives" file has the following entries

    	fukachan@phys.titech.ac.jp	r=axion.phys.titech.ac.jp
    	Elena@phys.titech.ac.jp		r=axion.phys.titech.ac.jp
    	cocoa@phys.titech.ac.jp		r=axion.phys.titech.ac.jp

    FML injects

    	@axion.phys.titech.ac.jp:fukachan@phys.titech.ac.jp
    	@axion.phys.titech.ac.jp:Elena@phys.titech.ac.jp
    	@axion.phys.titech.ac.jp:cocoa@phys.titech.ac.jp

    sendmail 8.x delivery aggregates SMTP sessions to axion.
    On axion, MTA segregates it to three mails.

    4.2	Default relay server

    You can set up $DEFAULT_RELAY_SERVER. it is used as a default relay
    server. FML recognizes all recipients should be delivered via the
    relay server. FML interprets entries in "actives" has
    r=$DEFAULT_RELAY_SERVER.

    	$DEFAULT_RELAY_SERVER

    4.3	Relay Based On Actives File (Sendmail 5.X)

    	fukachan@phys.titech.ac.jp	r=axion.phys.titech.ac.jp
    	Elena@phys.titech.ac.jp		r=axion.phys.titech.ac.jp
    	cocoa@phys.titech.ac.jp		r=axion.phys.titech.ac.jp

    In Sendmail 5.x, you require additional orderings by relay server in
    "actives".

    4.4	Cf (By motonori@wide.ad.jp) Style Relay Configurations

    When $RELAY_HACK = 1; is defined and $CF_DEF (CF style static delivery
    rule file) exists, FML controls relaying based on it.

    CF style example:
    	send e-mail for or.jp domain to mlrelay0.domain0.

    	GW smtp-ignmx:  mlrelay0.domain0
    	DOM or.jp

    CF style example2:
    	send mails not for co.jp to mlrelay.domain.
    	send e-mail for or.jp domain to mlrelay0.domain0.

    	NGW smtp-ignmx: mlrelay.domain
    	DOM co.jp
    	GW smtp-ignmx:  mlrelay0.domain0
    	DOM or.jp

    SMTP library uses hashes %RELAY_NGW, %RELAY_GW, %RELAY_NGW_DOM for
    control of this relay routings.

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