[Mailman-Users] hardware spec for 5000 user lists

[Ryan Northey]

hi there,

i have been asked by client to provide 5 x 5000 user mailing lists. I
believe they are to be used as announce lists.

I expect to use either postfix or qmail as the MTA, probably the former.

I was wondering if anyone has experience of using high-volume mail lists
and could recommend a minimum hardware spec that i would require to run
all these lists on the same server. 

I would also appreciate any advice/guidance on specific issues i might
need to consider or avoid, and what might happen if mailman/MTA becomes
overloaded.

Thanx in advance,

cheers,

ryan.