From: Wietse Venema (wietseporcupine.org)
Date: Thu Nov 01 2007 - 08:19:50 CDT

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Victor Duchovni:
> On Thu, Nov 01, 2007 at 06:17:11PM +0800, Bruce Cheng wrote:
>
> > Dear all,
> >
> > I meet some mail server can't be connected, and my mail server will
> > keep trying to send out the message. I know I could check the maillog
> > to see if it is sent out, but how do my users know their message were
> > sent out successfully ?
> >
> > Is there any way to notify users while their message were sent out
> > successfully before the setting of "bounce_queue_lifetime" ?
> >
> > Any suggestions will appreciate.
>
> http://www.postfix.org/postconf.5.html#delay_warning_time
>
> I use "2h" (delay warning after 2 hours). The delay warning is only sent
> once. If delivery ultimately fails, the next notice is the bounce.

With Postfix 2.3 and later the sender can request SUCCESS notification.
See http://www.postfix.org/DSN_README.html.

        Wietse

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