Load Balancing for Proxy & MTA

[joshdaone]

Hi there,

I'm planning a high availability arch for Zimbra deployment with 2 MTA/Proxy, 2 Mailbox, and 2 LDAP servers. Physical Load Balancer is out of budget so I'd like to know the alternative way to do the load balancing.

I'd like to know that if Zimbra ZCS 8.7.x support round-robin in Proxy and MTA server? I checked all the docs but found nothing about it.

And for mailbox server, does it support single node failure and protect user access from the server down?

Thanks in advance.