>My company is looking to double it's size.
does that mean double in mail traffic? >To that end I need to come up with general costs for this. > >What is the recommended hardware config and costs for the following: > > Dedicated Postfix server for outgoing mail ( * 2) just extrapolate for the traffic you have now, where you 2 MX and 1 outbound gateway. are those machines overloaded? I'm not sure you have to change from what you have now. you could pump them up a bit: 1. go from 512 MB to 1024 MB, allowing for more simultaneous processes, and for running BIND8 on each machine. 2. add a second SCSI caching controller with RAID1 disks to handle the posfix mailqueue >Dedicated Postfix server for anti-virus ( * 2 ) same here, more RAM and added disk + caching controller. >Dedicated iMail server for 25k users. ah, this totally different question, esp if you have a lot of webmail users, which might cause you to need 2 GB and 2 GHZ cpus for the compute load. However, the disk channels would get exactly the same treatment as the SMTP gateways: more controllers, + caching, segregate imail queue to its own partition and separate from the mailbox disk(s). Len
