Hello
For load balancing create several POP and IMAP proxies with an IPVS load balancer in front. Use Perdition on the POP and IMAP proxies to direct the connection to the correct back-end server that has the mail.
I had used Perdition+LDAP and it works fine!!!
My question: do you know any software like Perdition but for FTP service?
I use FTP+LDAP accounts (proFTPd+mod_ldap), a proxyFTP with LDAP support would be easily implemented by me.
-------- |ProxyFTP| -------- |____________ / \ \ \ ---- ---- |FTP1| |FTP2|..... ---- ----
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