From: mark david mcCreary <mdm@internet-tools.com>
Date: Tue, 5 Dec 2000 09:25:20 -0600

Exim 3.20 has a feature that allows a large mailing of a single message to
be sent to many different relays.  This is useful for mailing lists, as it
allows the message to be relayed to multiple machines, in groups of 100
addresses, for final delivery.

The router lists a host, but it does not really use that host.  Instead the
list of host machines in the transport are used in a random order, thus
getting a reasonable coverage and compensating for delivery machines and
networks that are down.

######################################################################
#                      TRANPORTS CONFIGURATION                       #
######################################################################

one_hundred_smtp:
  driver = smtp
  gethostbyname
  hosts = a.domain.com:\
          b.domain.com:\
          c.domain.com:\
          d.domain.com
  hosts_override
  hosts_randomize
  max_rcpt = 100

######################################################################
#                      ROUTERS CONFIGURATION                         #
######################################################################

disperse_mail:
    driver = domainlist
    transport = one_hundred_smtp
    self = fail_soft
    host_find_failed = fail_soft
    route_list = "* a.domain.com bydns_a"

mark david mcCreary
Internet Tools, Inc.            1302 Waugh Drive, #438
mdm@internet-tools.com          Houston, Texas 77019
http://www.internet-tools.com   713.627.9600