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From: Grant Taylor via COFF <>
Subject: [COFF] Re: Status of
Date: Mon, 20 Jun 2022 23:12:01 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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On 6/20/22 9:59 PM, Tomasz Rola wrote:
> As you might know, when the target does not receive email, sender 
> will try to send it to backup receiver(s), here:

That's the idea.  At least in an ideal world.  Sadly, I've experienced 
too many ... less than ideal installations.

>         1799    IN      MX      10
>         1799    IN      MX      10

Those are actually two equal weight peer MXs.  There's nothing 
differentiating one as primary and backup.  The "10" would need to be 
different between the two records.

> I infer that the actual date when email will get dumped to /dev/null
> depends on settings of relevant mail servers (MTAs) - either sending one
> or backup receiver.

In an ideal world, messages would never be dumped to /dev/null.  Per RFC 
-- the bible of interoperability on the Internet -- messages should 
never be lost.  Instead, such ultimate undeliverables situations should 
be reported to the (purported) sender.

> If there is a way to get those value remotely by talking to the server, 
> I have not yet dug it up, nor looked.

I'm not aware of anything in the SMTP protocol that is applicable for 
getting such information.  Sometimes it can be inferred by observing 

I did receive such a Delivery Status Notification (a.k.a. DSN) from five days after I sent a message to cctalk.

> I assume it might be about two weeks in case of classiccmp and each
> email author should be notified when his email fails to reach a
> recipient. So, we will see (experiment by doing nothing...),

Yep.  Hence "inferred by observing".  ;-)

Grant. . . .
unix || die

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  reply	other threads:[~2022-06-21  5:11 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-14 22:16 [COFF] " Warren Toomey via COFF
2022-06-14 22:27 ` [COFF] " Jason T
2022-06-15  5:14   ` Tomasz Rola
2022-06-15 15:37     ` Grant Taylor via COFF
2022-06-21  3:59       ` Tomasz Rola
2022-06-21  5:12         ` Grant Taylor via COFF [this message]
2022-06-22 21:03 ` Grant Taylor via COFF

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