Redundant POP servers

From: Greg Kaloutsis (gregk@qld.gov.au)
Date: Wed Nov 26 2003 - 01:58:08 EST


Folks I'd appreciate some ideas on how to implement the following

Equipment
Two MTA's
Two POP servers
Content switch for load balancing.

Currently email is received at the two MTA's via DNS mx records.
 From there any local emails are delivered to the two POP servers. This
is accomplished using the Mhub [IPC] feature of sendmail.

The difficult or unknown part is how to synchronize the pop servers
That is to say if mail gets delivered to both servers then how do you
handle users popping email off only one server?
The pop servers would quickly fall out of sync?

I guess in summary is there such a thing as a pop daemon that is aware
of other pop daemons or that is capable of handling two message stores
on different servers?

Appreciate any pointers.

-- 
Gregory Kaloutsis
Govnet
Information and Communication Technology
Information Economy Technology
Department of Innovation and Information Economy
Ph: 61 7 3224 2569
Fax: 61 7 3225 1433
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