I'm running a set of domains with about 50K users now using mysql. Depending on how you're going to structure the qmail+vpopmail environment there're a number of things you can do to overcome the slightly slower mysql. What I do is run a local read-only copy of the mysql database on each of my qmail servers, which are replicated off of a master read-write copy.
Delivering roughly 500K messages per day to this cluster I'm running three servers for qmail, vpopmail, courier-imap/pop3, squirrelmail. Two are dual P3s at 1ghz, and one is a dual Athlon XP 2400+, and performance is more than acceptable (its a pretty darn fast cluster imho). The master read/write mysql database is running on a semi-ancient Sun E250, however there's not a lot of writing going on as I turned off mysql logging in vpopmail.
Hope that helps,
Nick Harring
Rodrigo Pinheiro wrote:


I've a domain with 30,000 accounts +/-, it's running on iplanet solutions
I need migrate that solution to free software, because iplanet is very

I'd like to know which module to use for autentication,


SQL is more slow LDAP,

but I seen that MYSQL module is more used and more accept.


Rodrigo Pinheiro

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