> 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: postmaster@???
>> 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 postmaster@???; Wed, 09 Jan 2013 10:30:40
>> +0100
>> Auto-Submitted: auto-replied
>> From: Mail Delivery System <Mailer-Daemon@???>
>> To: postmaster@???
>> Subject: Message frozen
>> Message-Id: <E1Tsrzc-0001Lv-DR@???>
>> 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:
>> some.one@???: 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)?
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?
Sincerely
tovis
