[exim] Message with error freeze instead of NDR

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Author: Thomas Hommers
Date:  
To: exim-users@exim.org
Subject: [exim] Message with error freeze instead of NDR
Hi,

I am running exim as an email gateway and have a problem with a few spam messages. The gateway itself does currently no content checking and is just forwarding any message as long the recipient is valid. However the destination server might reject some messages based on it’s own spam filter. For most messages that works fine, that means that in case the destination server rejects a message, exim creates a NDR to the sender and drops the message.
Only with a few messages, exim freezes the message after delivery error and does not create a NDR, it’s continue trying to deliver.

Here are some details:

exim -Mvh 1WieCZ-00030T-GL
1WieCZ-00030T-GL-H
Debian-exim 101 103
<>
1399616555 0
-helo_name static.vnpt-hanoi.com.vn
-host_address 222.252.20.152.2119
-interface_address 1.2.3.4.25
-received_protocol smtp
-body_linecount 2
-max_received_linelength 77
-frozen 1399683558
-manual_thaw
XX
1
nikki@???

189P Received: from [222.252.20.152] (helo=static.vnpt-hanoi.com.vn)
    by mx.mydomain.com with smtp (Exim 4.72)
    id 1WieCZ-00030T-GL
    for nikki@???; Fri, 09 May 2014 14:22:36 +0800
141P Received: from unknown (HELO localhost) (gonj@???@144.137.192.218)
    by 222.252.20.152 with ESMTPA; Fri, 9 May 2014 13:26:40 +0700
026F From: gonj@???
029T To: nikki@???
044  Subject: Improve your relationship with her
037  Date: Fri, 9 May 2014 13:11:56 +0700


exim -Mvb 1WieCZ-00030T-GL
1WieCZ-00030T-GL-D
Unbelievable improving effect on male health http://concerning.burra.ru/

exim -Mvl 1WieCZ-00030T-GL
2014-05-09 14:22:36 Received from <> H=(static.vnpt-hanoi.com.vn) [222.252.20.152] P=smtp S=541
2014-05-09 14:28:48 nikki@??? R=direct_route_mx_dynamic T=remote_smtp_cert_dynamic: SMTP error from remote mail server after end of data: host mx-intern.mydomain.com [2.3.4.5]: 550 5.7.1 Message rejected as spam by Content Filtering.
*** Frozen (delivery error message)

Does anybody has an idea what could be the reason for this message to behave different than others?

Thanks,
Thomas