relay in sendmail

promiscuous_relay
                By default, the sendmail configuration files do not permit
                mail relaying (that is, accepting mail from outside your
                domain and sending it to another host outside your domain).
                This option sets your site to allow mail relaying from any
                site to any site.  In general, it is better to control the
                relaying more carefully with the access db and the 'R'
                class ($=R).  Domains can be added to class 'R' by the
                macros RELAY_DOMAIN or RELAY_DOMAIN_FILE (analogously to
                MASQUERADE_DOMAIN and MASQUERADE_DOMAIN_FILE, see below).

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