Rick King:
> Hello All,
>
> I'm trying to figure out bounce messages. Their is a parameter that
> controls the mail queue lifetime (maximal_queue_lifetime), and by default
> this is set at 5days. I changed the maximal_queue_lifetime parameter to one
> day, because I want the email to return to sender if it is not deliverable
> after one day.

So far, so good.

> To resolve this, I used this parameter (defer_transports = smtp), which
> queues the undeliverable email. But with (maximal_queue_lifetime = 1d)
> parameter, the email does not return to sender.

"defer_transports = smtp" disables *all* mail delivery via SMTP.

        Wietse
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