Hello. What about LVS w/ qmail+vpopmail for load-balancing and ha of SMTP and POP3 services ? I'm worried about the ability of LVS to support ~ 300 POP3 + 200 SMTP concurrent connections. The use of LVS will make the administrator's live easier for load-balancing feature and high-availability capacity of lvs with mon, but what about performance of the single load balancing server that will get a lot of connections?
Any advice will be appreciate. Regards -- Davide Giunchi.