I am testing out a new installation of Exim 4.50. I currently use Exim 4.30,
and have changed the settings in the configuration file to use the inbuilt
MIME decoding rather than the deprecated demime option.
The problem I'm now having is that with most attachments I am getting a MIME
error. The $mime_anomaly_text contains "Broken BASE64 encoding detected".
I've tried it with varous zip and doc files and and 3 different mail
clients. However, some files work perfectly every time.
Is there any way to diagnose the problem?
This is the output from one instance running Exim with -d+acl:
6768 >>Headers after rewriting and local additions:
6768 F From: Nigel Wade <nmw@???>
6768 T To: nmw@???
6768 Subject: test
6768 Date: Thu, 7 Jul 2005 17:28:09 +0100
6768 User-Agent: KMail/1.6.2
6768 MIME-Version: 1.0
6768 Content-Disposition: inline
6768 Content-Type: Multipart/Mixed;
6768 boundary="Boundary-00=_ZgVzCy02G9y9/3m"
6768 I Message-Id: <200507071728.09373.nmw@???>
6768
6768 Data file written for message 1DqZFA-0001lA-2Q
6768 >>Generated Received: header line
6768 P Received: from [143.210.44.106] (helo=nmw-office.ion.le.ac.uk)
6768 by mail.ion.le.ac.uk with esmtp (Exim 4.50)
6768 id 1DqZFA-0001lA-2Q
6768 for nmw@???; Thu, 07 Jul 2005 17:28:56 +0100
6768 Found Content-Type: header - executing acl_smtp_mime.
6768 Found content-disposition: MIME header, value is 'inline'
6768 Found content-type: MIME header, value is 'multipart/mixed'
6768 Found boundary= MIME parameter in content-type: header, value is
'Boundary-00=_ZgVzCy02G9y9/3m'
6768 using ACL "acl_check_mime"
6768 processing "deny"
6768 check condition = ${if match {${lc:$mime_filename}}
{\N(\.exe|\.scr|\.vbs|\.pif|\.bat|\.scr|\.lnk|
\.com)$\N} {1}{0}}
6768 = 0
6768 deny: condition test failed
6768 processing "deny"
6768 check decode = default
6768 check condition = ${if > {$mime_anomaly_level}{1} {true}{false}}
6768 = false
6768 deny: condition test failed
6768 processing "accept"
6768 accept: condition test succeeded
6768 Entering multipart recursion, boundary 'Boundary-00=_ZgVzCy02G9y9/3m'
6768 Next part with boundary Boundary-00=_ZgVzCy02G9y9/3m
6768 Found content-type: MIME header, value is 'text/plain'
6768 Found charset= MIME parameter in content-type: header, value is
'us-ascii'
6768 Found content-transfer-encoding: MIME header, value is '7bit'
6768 Found content-disposition: MIME header, value is 'inline'
6768 using ACL "acl_check_mime"
6768 processing "deny"
6768 check condition = ${if match {${lc:$mime_filename}}
{\N(\.exe|\.scr|\.vbs|\.pif|\.bat|\.scr|\.lnk|
\.com)$\N} {1}{0}}
6768 = 0
6768 deny: condition test failed
6768 processing "deny"
6768 check decode = default
6768 check condition = ${if > {$mime_anomaly_level}{1} {true}{false}}
6768 = false
6768 deny: condition test failed
6768 processing "accept"
6768 accept: condition test succeeded
6768 Next part with boundary Boundary-00=_ZgVzCy02G9y9/3m
6768 Found content-type: MIME header, value is 'application/x-zip'
6768 Found name= MIME parameter in content-type: header, value is 'test.zip'
6768 Found content-transfer-encoding: MIME header, value is 'base64'
6768 Found content-disposition: MIME header, value is 'attachment'
6768 Found filename= MIME parameter in content-disposition: header, value
is 'test.zip'
6768 using ACL "acl_check_mime"
6768 processing "deny"
6768 check condition = ${if match {${lc:$mime_filename}}
{\N(\.exe|\.scr|\.vbs|\.pif|\.bat|\.scr|\.lnk|
\.com)$\N} {1}{0}}
6768 = 0
6768 deny: condition test failed
6768 processing "deny"
6768 check decode = default
6768 check condition = ${if > {$mime_anomaly_level}{1} {true}{false}}
6768 = true
6768 deny: condition test succeeded
6768 unspool_mbox(): unlinking
'/var/spool/exim/scan/1DqZFA-0001lA-2Q/1DqZFA-0001lA-2Q-00002'
6768 unspool_mbox(): unlinking
'/var/spool/exim/scan/1DqZFA-0001lA-2Q/1DqZFA-0001lA-2Q-00000'
6768 unspool_mbox(): unlinking
'/var/spool/exim/scan/1DqZFA-0001lA-2Q/1DqZFA-0001lA-2Q-00001'
6768 unspool_mbox(): unlinking
'/var/spool/exim/scan/1DqZFA-0001lA-2Q/1DqZFA-0001lA-2Q.eml'
6768 SMTP>> 550-Message rejected. The message contains a MIME error
(Broken BASE64 encoding
6768 SMTP>> 550 detected)
6768 LOG: MAIN REJECT
6768 H=(nmw-office.ion.le.ac.uk) [143.210.44.106] F=<nmw@???>
rejected during MIME ACL check s: MIME
ERROR (Broken BASE64 encoding detected)
--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@???
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555
