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Subject: Re: RBL use and unavailable RBL servers
From: Wietse Venema (wietseporcupine.org)
Date: Wed Nov 01 2000 - 13:51:44 CST

Pete O'Hara:
> Hi,
> I am new to using RBLs with Postfix. My question is what does Postfix do
> when checking an RBL and there is very slow or no response? Does it hang
> waiting or is there some timeout value that can be set? What happens to
> the mail delivery of the messages that caused the RBL check in this
> situation?

All DNS lookups are subject to timeout, and RBL is no exception.
If RBL lookup times out the mail will be received.

        Wietse