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keizersozay
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Joined: 26 January 2005 Location: United States Status: Offline Points: 77 |
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Topic: Base64 encoding Posted: 21 December 2004 at 10:08am |
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Good Morning, I've noticed that the bayes filter has been blocking several emails that just appear as several lines of random text, but if you copy the entire text of the email out of the quar and save it as an eml file it opens to read perfectly readable spam. I was baffled as to how this is done. Then when reading some spam articles and found this http://david.carter-tod.com/base64/default.asp My question is this. The emails that are encoded this way seem to all have this line of text Thanks. |
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Desperado
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Joined: 27 January 2005 Location: United States Status: Offline Points: 1143 |
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Posted: 21 December 2004 at 11:46am |
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First off ... the only "Valid" Base 64 stuff should be image attachments NOT Text. |
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CyberBob
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Posted: 21 December 2004 at 11:53am |
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I don't even has this setting in my ini file? Is this a new revision or a manual entry only?
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Desperado
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Posted: 21 December 2004 at 12:15pm |
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It has bee around for quite a long time AND it is a manual entry only. Add in in and restart the SF Service It shows up in the Reject Details as: Found Keywords: [Found Content-Transfer-Encoding=base64 and Content-Type=text/html/plain] Dan S. |
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keizersozay
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Posted: 21 December 2004 at 12:44pm |
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Thank you very much Dan
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Desperado
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Posted: 21 December 2004 at 12:54pm |
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No problem ... let me know wow it works out for you. Dan S.
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CyberBob
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Posted: 21 December 2004 at 1:00pm |
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Yes thanks Dan! Any other "Dan" entries we should add to the .ini file? Thanks, Bob |
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Desperado
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Posted: 21 December 2004 at 4:59pm |
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The only one's I can think of that I have comments on are:
MaxMsgSizeForKeywordScan=28
I have found that anything larger than this is a waste of CPU and energy.
ScanReceivedHeaders=1
Hmmm ... This can really cause the Bayesian to get whacked out on a high traffic server. I have it set to 1 (ON) but combine it with a short "CleanUpCorpusIntervalDays=" of say 1-4 days depending on traffic.
ExpireRetryQueueHours=24 This prevents totally undeliverable, queued messages from trying to "flush" forever. On my backup "Queuing" Server, This is set to more like 120 but my primary is set to 24.
Regards,
Dan S.
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 21 December 2004 at 9:18pm |
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As Dan correctly stated, there is an SpamFilter.ini file parameter to filter all emails with that encoding. We just noticed that while this addition was mentioned in the release notes for build 1.2.0.178, that was the *only* place where it was documented. The option is not documented in the readme.html file, nor does it appear with the default value of "0" in the SpamFilter.ini file. We apologize for this, and will update the documentation on the next release.Roberto F.
LogSat Software
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