Re: ReW: Spam and NDR

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"Robert Williams"
<RobertW@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

[ snip ]

>My apologies,

None needed.

>like I said earlier (I think), I'm still learning this, that just
>sounded logical to me. Because I (postmaster) do receive e-mails intended for
>recipients that do not exist, I was expecting them to be "Delivered". You're
>saying that is not the case?

You only get a copy of the NDR because you accept messages for
addresses that don't exist. If you refused to accept messages like
that you'd never get a copy of an undelivereable message unless it was
for some other reason than "Unknown recipient".

>Are you saying that even if I have the "Allow delivery report" and "Allow
>Non-delivery report" options unchecked (disabled) then the Exchange system still
>sends the DRs and NDRs?

No. I'm saying that 1) you shouldn't turn those DSN's off, and 2) you
shouldn't accept mail you can't deliver.

>Are those just for internal accounts? So that if *I*
>was to send an e-mail to a recipient that does not exist, my server would not
>create the NDR and send it to me.

That would depend on what you used to send the message and the server
to which you sent it.

If you use a MAPI/RPC client like Outlook you'd get a NDR.

If you use a SMTP client like Outlook Express you'd get an error, but
no NDR.

>Got me interested in how this works now.

The MAPI/RPC client doesn't use the same mechanism as a SMTP client to
send mail, so let's not talk about them at all.

Within your own organization, NDR's are still sent.

>I just sent an email to my e-mail account and a fake e-mail address
>@<mydomain>.com. With the NDRs being forwarded to postmaster@<mydomain>.com, I
>received the e-mail and the NDR at the same time, but the account I sent the
>e-mail from did not receive the NDR.

That's because you have the *sending* of NDR's turned off. The
*generation* of NDR's still takes place.


--
Rich Matheisen
MCSE+I, Exchange MVP
MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm
Don't send mail to this address mailto:h.pott@xxxxxxxxxxxxx
Or to these, either: mailto:h.pott@xxxxxxxxxxxxxxx mailto:melvin.mcphucknuckle@xxxxxxxxxxxxx mailto:melvin.mcphucknuckle@xxxxxxxxxxxxxxx
.

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