From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Thu Sep 01 2005 - 09:58:44 CDT

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On Thu, Sep 01, 2005 at 09:37:36AM +0200, Pavel Urban wrote:

> how does Postfix react when
>
> - there are many e-mails destined to one domain
> - when the first delivery attempt is made, remote server responds with
> 4xx on HELO

If there are no backup MX hosts, the first message is deferred, and the
destination is decremented by one from $initial_destination_concurrency
(default 5). If "$initial_destination_concurrency" messages in a row
all fail, the destination is throttled for $minimal_backoff_time.

If there are backup MX hosts, they are tried.

> ? Is this behaviour configurable?
>

You can raise the initial_destination_concurrency limit (but it cannot be
raised past the per-transport or default destination concurrency limit).

See QSHAPE_README.

--
        Viktor.

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