seena--- via Postfix-users:
> we have a single lmtp end point which is pointing load balancer .
> 
> Lmtp endpoint  ---> Load balance --> Dovecot director --> Dovecot
> backend

What is an endpoint: TCP socket, UNIX-domain socket, avian carriers,
and how is Postfix configured to CONNECT TO that endpoint? Your
posting has no information about that.

- What is the output from:

        postconf -n  | grep "lmtp:" #### note the trailing ":"

        postconf -M | grep lmtp     #### note no trailing ":"

> If any one of the backend failed we are seeing the delay in lmtp
> delivery to even the other backend which are healthy. How to solve this

What does "failed" mean? In other words, What is the error message?

> We need to make sure that only the delivery to the failed backend
> should fail and rest all should work as expected

If a backend becomes unhealthy, then the next connection from Postfix
shoule immediately be routed to a healthy backend, without any delay. 

Without further information I cannot distinguish between:

- Postfix is reusing a failed connection. If that is the case,
disabling connection reuse should make a difference.

- The load balancer is not working proiperly.

        Wietse

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