Home » Kerio User Forums » Kerio Connect » How are mails considered phishing spam (every now and again mails within our network are filtered as phishing spam)

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Dear Kerio-Community,
we run the most recent version of KC 9.2.2, no spam assassin activated (yet), bitdefender Anti Spam active, company network whitelisted, spam filtering configuration "process messages from trusted sources (SMTP / relay options) active - and I will not change that setting.

Problem is: Every now and then a mail from within our network will is being considered "phishing spam". I need to analyze why.
It is always a Mail containing a zipped PDF file - which - being a prepress department - is daily business of course.
I can reproduce that behaviour but not really identify the reason.
I can send a zipped or unzipped PDF file with a few numbers and a colored area to a colleague and it gets filtered. I can send a different PDF zipped or unzipped and all is fine.
How does that phishing spam filter work?

Thanks a bunch and all the best from Germany

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Same for me, several mails containing .zip files are considered phishing spam and rejected as such for whatever reason.
I haven't been able to find out any regularities on this behavior and sadly there's no phishing settings in Kerio either.

Kind Regards

[Updated on: Thu, 26 October 2017 13:57]


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Hi Fabian,

I did not manage to find the exact answer - but the workstation using the account in question was contaminated with malware which might have been able to create contaminated zip files.
After cleaning the computer I never had this problem again.
I did manage to create a zip file with the exact same data on another station and send it using the same mail account as on the original station without a problem so I assume the malware really was the root of the culprit.

all the best
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