David,
A List Server message has a slightly different header than a users email
message. The field and data is: 'Precedence: bulk' and some SMTP receivers
might check this and refuse the message.
'Unknown User' responses (from the remote end) usually come before any
header info is transmitted (and the error message comes from the local
Postmaster). 'Failed after X tries' responses (from the local postmaster)
usually mean that DNS information is available (or error msg would have been
'unknown domain'), but IMail could not connect to the host, or connected,
but could not deliver (connection refused by remote, or connection dropped
before full delivery).
Email to large sites, may have multiple MX hosts and they may not all be
running the same software or configured the same, so it is possible that one
email will go one route and another email, a different route, leading to
this 'some do, some don't' kind of symptom.
Client side 'rules/filters' could also lead to different responses for
different message sources, subjects, headers and such.
Really need logs and actual 'bounced' email, to know what is happening in
each situation.
Daniel Donnelly
_______________________________________________________
----- Original Message -----
From: "David Dodell" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, December 28, 2000 1:25 PM
Subject: [IMail Forum] Mail from Mailing lists being rejected.
> Hi, I've noticed a problem with certain addresses ( no pattern yet)
> ... that mail sent that originates from a mailing list on my Imail
> server will bounce back to the owner address with either "user unknown"
> or "mail undeliverable" ... but if I send a single email message
> myself, I can watch the server deliver it without any problem.
>
> Why would mail become undeliverable from a list originated message but
> not an individual user?
>
> David Dodell
>
>
> Please visit http://www.ipswitch.com/support/mailing-lists.html
> to be removed from this list.
>
> An Archive of this list is available at:
> http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
>
Please visit http://www.ipswitch.com/support/mailing-lists.html
to be removed from this list.
An Archive of this list is available at:
http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
