Sudden increase in spam false positives

Hi all,

Since Thursday 3rd January many of my clients have seen a huge and sudden overnight increase in the number of spam false positives - regular correspondants mails are to be found in the junk folder. Same happened to me. Also other IT guys I know have reported the same thing with their clients, started the same day. Only way they fixed theirs is to disable the junk folder - PERIOD.

Any ideas what the cause could be?

Many thanks,

Alasdair
AlasdairbAsked:
Who is Participating?
 
Andrew DavisConnect With a Mentor ManagerCommented:
More information please.

What version exchange.
What third party spam filters you may have in place.
What spam filters you have set on your server.

cheers
Andrew
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AlasdairbConnect With a Mentor Author Commented:
Hi Andrew,

thanks for responding. Exchange 2007/2010, I have disabled Exchanges builtin intelligent mail filter on one client as a test and no change. I am now leaning to think it is Trend Micro's Messaging Security Agent which runs on the Exchange machines. This is on all my clients machines so is a common factor. Yesterday I disabled it on the same client whose IMF is disabled and have removed Trend Micro completely from my own server.

Waiting to see how this pans out. I will post how it goes.

Many thanks,

Alasdair
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Andrew DavisManagerCommented:
Ok
I will await furhter investigation.

Cheers
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AlasdairbAuthor Commented:
Andrew,
Well no more spam false positives since I disabled Trend Micros Messagung Security Agent - hardly ideal as now we are getting more viruses at the desktops. No news of a fix from TM that I can see.
I give you some points as you mentioned checking for third party filters .

Thanks,

Alasdair
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