On 01/14/2013 02:04 AM, tovis wrote:
On 01/11/2013 04:36 PM, tovis wrote:
I'm using exim4 configured with "smart host" on Debian Squeeze.
Also I have fetchmail, courier IMAP and apache2, php5, squirrelmail
combo
for mailing (I have several two booting boxes with win and linux - it
was
the easiest way to have mailing infrastructure for both systems). For
long
time I have no pőropblems, but now I have got several error messages
from
my "smart host":
Header (as it shown in Squirrelmail):
Return-path: <>
Envelope-to: [email protected]
Delivery-date: Wed, 09 Jan 2013 10:30:40 +0100
Received: from Debian-exim by samu.bubu.dyndns.ws with local (Exim 4.63)
id 1Tsrzc-0001Lv-DR
for [email protected]; Wed, 09 Jan 2013 10:30:40
+0100
Auto-Submitted: auto-replied
From: Mail Delivery System <[email protected]>
To: [email protected]
Subject: Message frozen
Message-Id: <[email protected]>
Date: Wed, 09 Jan 2013 10:30:40 +0100
Message (as it shown in Squirrelmail):
Message 1Tsrzb-0001Ls-U7 has been frozen (delivery error message).
The sender is <>.
The following address(es) have yet to be delivered:
[email protected]: SMTP error from remote mail server after MAIL
FROM:<>
SIZE=2673: host smtp.upcmail.hu [213.46.255.2]: 550 5.1.0 <> sender
rejected
I think these emails are reading confirmation.
I think, that problem is "Return path" and "sender" fields are empty.
It could be solved by exim4 configuration? It could be the problem of
exim4? I'm not sure :(
Any help?
Is smtp.upcmail.hu you, or under your control? Is it your smart-host?
It looks like it's trying to deliver an empty-sender mail to "bigfirm.hu".
What's the relationship with your "dyndns.ws" address; why did it send
this
notification there?
Can you find out why the empty-sender mail was produced? They're
legitimate for
Delivery Status Notifications (DSNs), of which one class is a "bounce"
(that is, a notification
of failure to deliver).
Have a look at your logs.
It could just be that "bigfirm" are clueless, in rejecting all DSNs.
It could, at the same time, be that some spammer faked a "bigfirm" sender
address, and you accepted the spam and only later decided you couldn't
deliver it, so you generated a bounce. This is legal per the mail
protocol
standards, but suboptimal in a spam-filled world. If so you need to work
harder at spotting and rejecting spam during the SMTP conversation.
--
Cheers,
Jeremy
Thanks for answer Jeremy!
smtp.upcmail.hu is my smart host (UCP is my internet provider to).
I only suspect, that those are "reading confirmation". When sender is
asking for it, yout open the mail, and send a confirmation - this is
clalled Delivery Status Notifications (DSNs)?
It's plausible that "reading confirmations" are implemented as DSNs.
You right, it is only a suspect, because some of my contacts said that
they would not got confirmation from me. But for years our email addresses
where used for spam - I've got several times offer for job from myself :)
I do not know where emails with empty sender are created. I'm use
squirrelmail as MUA and exim4 as MTA. I do not see how does it work, and
where sender is became empty (even I do not understand why exim4 is
transferring these emails, I thought it is restricted by default).
The first question, could exim4 deliver such an email?
Yes, unless specifically configured to not do so.
Look at the logs.
--
Jeremy
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