> c) I assume that both webfront ends have the ability to setup server side 
> "out of office" replys?

Don't know about these, but if you're going to use a webmail Horde/IMP
has a "vacation" module, not sure how it works though, I haven't
checked. You can also hack your own using a CGI setting up a .forward in
the user's home dir that invokes the "vacation" command (yes it's kind
of nasty but usable).

> 
> d) Now heres maybe a tough one... has anyone played with trying to build a 
> TSL 3.x high availablity mail server? I wander what options there might be?
> 

I use the poor man's cluster: rsync in a shell script invoked by
crontab, a cold standby box and either dynamic DNS or a redirector
front-end. Rsync is quite workable with Maildir mailboxes, even many/big.
This is for POP/IMAP/outgoing SMTP.
It's admittedly not perfect, mail received since the last rsync is
offline after you fallback to the standby server, and after you switch
back to the master one, you need to resync by hand. It's the cheap
approach.

For incoming SMTP backup MX works just fine.

Greets,
_Alain_
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