"Banned Content" question - possibly a Web Bug code problem

[Quentin Campbell]

Julian

The version of MailScanner on which I have seen the problem is 4.35.10.

Quentin
---
PHONE: +44 191 222 8209    Information Systems and Services (ISS),
                           University of Newcastle,
                           Newcastle upon Tyne,
FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
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"Any opinion expressed above is mine. The University can get its own."  

>-----Original Message-----
>From: MailScanner mailing list 
>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Julian Field
>Sent: 12 January 2005 15:30
>To: MAILSCANNER at JISCMAIL.AC.UK
>Subject: Re: "Banned Content" question - possibly a Web Bug 
>code problem
>
>What version of MailScanner are you using? I slightly improved the
>locking code (took out an "improvement" I made a long time ago which I
>only made after lots of people requested it) in 4.37. It now locks the
>df as well as the qf, which slows down delivery slightly in some
>situations, but appears to be more reliable than just locking the qf.
>
>Quentin Campbell wrote:
>
>>>-----Original Message-----
>>>From: MailScanner mailing list
>>>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Mike
>>>Sent: 12 January 2005 11:53
>>>To: MAILSCANNER at JISCMAIL.AC.UK
>>>Subject: Re: "Banned Content" question - a related problem
>>>
>>>
>>>
>>>>From: MailScanner mailing list 
>[mailto:MAILSCANNER at JISCMAIL.AC.UK] On
>>>>Behalf Of Quentin Campbell
>>>>
>>>>All the systems are now up2date as far as RH AS 3 patches are
>>>>
>>>>
>>>concerned.
>>>
>>>
>>>>All the systems use the Sendmail that comes with these
>>>>
>>>>
>>>system; the last
>>>
>>>
>>>>time they were updated this was Sendmail 8.12.11. I use the default
>>>>locking in MailScanner.
>>>>
>>>>
>>>I also had this problem on sendmail 8.12.10. After changing
>>>the locking to posix, the problem was gone. So, although the
>>>docs state that the locking problem occurs only from 8.13 on,
>>>it seems that also some 8.12 versions are affected. Please set
>>>the locking mechanism to "posix" and see if it solves your problem.
>>>
>>>
>>
>>I will do this as a last resort. There are four reasons why I want to
>>investigate other things first. In particular I want to capture a
>>message before then after it has gone through MailSanner and got
>>corrupted:
>>
>>1. Locking works OK on RH AS 3 systems with an up-to-date kernel.
>>2. The symptoms we are seeing do not appear to be repeatable so far
>>which makes conclusive testing difficult.
>>3. I have looked for other evidence of locking problems but 
>cannot find
>>any. For example I can show that all messages tagged as spam by
>>MailScanner have been tagged once only. If there is a locking problem
>>you will see the same message (ie. same Sendmail QID) being tagged as
>>spam more than once by two or more MS processes.
>>4. The problem appears related to the Web Bug check. I will 
>switch that
>>off first. See below for more details of this.
>>
>>Having looked further at the problem it appears to be related to MIME
>>multipart/alternative messages having all or part of the HTML part
>>corrupted. The text part is not being affected.
>>
>>In all of the cases the logs show that MailScanner has "disarmed" the
>>HTML content. Since I only "disarm" Web Bugs it appears that there may
>>be a bug in the Web Bugs code that causes an intermittent 
>problem. This
>>suspicion is reinforced by the observation that the problem appears to
>>have started when I enabled the Web Bug check late last year. I will
>>first of all try "Allow WebBugs = yes" and see what happens.
>>
>>Quentin
>>
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>>the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).
>>
>>Support MailScanner development - buy the book off the website!
>>
>>
>>
>
>--
>Julian Field
>www.MailScanner.info
>Buy the MailScanner book at www.MailScanner.info/store
>
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>
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>To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
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>Before posting, read the MAQ (http://www.mailscanner.biz/maq/) and
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>
>Support MailScanner development - buy the book off the website!
>
>

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