> Would the optimization retrieve some space? ie: reducing the table
> size?

It only recovers empty space and re-orders (like a defrag). If your
usage is increasing, the best way is to remove emails. Maybe you need to
run a dbmail-util to remove the deleted emails (there might be a SQL you
can run manually)

> ok, let say my database size is 760GB (and increasing), can i just:
> 1. shut down the mysql server,
> 2. change the mysql.cnf file, and 
> 3. restart the mysql server back up

My config file is for MySQL 5.0, so some parameters might be slightly
different. Otherwise, yes that should work fine. Take a backup though.

> p/s: my mail server hardware is similar to urs, running Fedora 10 with mysql
> ver 4.0.45.

I would consider a MySQL upgrade, I'm not sure how good MySQL 4.0 is
with dbmail.

> The number of incoming mails is larger than 20,000 daily, but most of them
> are blocked by the Barracuda spam firewall, reducing it to minimum 1000.

Indeed, we see 95% of emails blocked at our firewall, one day I turned
that off and averaged 10 incoming emails/second.

Regards,
Josh.

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