replication - more than 2 servers?

[Ron Cleven]

We tested dovecot for a fair amount of time and decided finally to put 
it into production under CentOS 7 (we are running 2.2.10).  I just 
joined the list, so I apologize for what is probably a question that has 
been answered many times, but I was wondering if there are any plans to 
implement replication among 3 or more servers (all "masters", as with 
2)?  As best as I can tell, replication seems to be limited to 2 
servers, and it is not obvious to me even how more than 2 would be 
supported syntactically in the configs.  That is, what might be an 
example of the "mail_replica" clauses if such a thing was supported?