[Dovecot] Dovecot replication not redirecting if server is down

[Patrick Westenberg]

Daniel Parthey schrieb:

> You need to keep the password database up-to-date and ensure to not return an unhealthy backend IP in the "host" extra field, since the knowledge of the proxy (as mentioned in the blog) is simply read from the passdb database. Database content needs to be maintained by external tools.

The blog says "One possibility is to use Dovecot proxies, which know 
which servers are down."

So why do I have to