Andrew Johnson wrote: > 2 other alternatives :- > > Hardware loadbalancer (such as Alteon or F5) > > Linux as a loadbalancer - there are various iptables options that can be > used to loadbalance connections, though I'm not sure how well these work if > one of your email servers goes down. > > At least with the Alteon load balancers, they can do helath checks and look > for smtp banners to decide if the server is available. >
Another free and secure alternative:
OpenBSD's hoststated as a loadbalancer.
hoststated is a host status daemon for server load-balancing. It moni-
tors groups of hosts for availability, which is determined by checking
for a specific service common to a host group. When availability is con-
firmed, Layer 3 and/or Layer 7 load-balancing services are set up by
hoststated.
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