I just wanted to point out that a vendor saying, "only way to stop these is to block all picture files" is *not* the same thing as that vendor recommending that you block all picture files. It's obviously impractical to block all picture files, and the vendor was undoubtedly just saying that to illustrate how hard it is to block image spam.
-Peter -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aristotle Zoulas Sent: Wednesday, December 13, 2006 10:43 AM To: Exchange Discussions Subject: RE: any anti spam recommendations Most of out spam come in the form of pictures, in other words the spam text is embedded in the picture. The vendor told us the only way to stop these is to block all picture files (gif, tif, jps, etc..) This is utter nonsense. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jose Manzano Sent: Wednesday, December 13, 2006 1:19 PM To: Exchange Discussions Subject: RE: any anti spam recommendations We use a Bayesian filter and works out well, but it's installed on the client side.... -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ben Schorr Sent: Wednesday, December 13, 2006 12:59 PM To: Exchange Discussions Subject: RE: any anti spam recommendations Just because that filter hasn't worked out shouldn't discredit all such filters. Bayesian filters, in general, are quite successful. Ben M. Schorr Chief Executive Officer ______________________________________________ Roland Schorr & Tower www.rolandschorr.com [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aristotle Zoulas Sent: Wednesday, December 13, 2006 7:49 AM To: Exchange Discussions Subject: RE: any anti spam recommendations We want to get a product that does not require training. We have fed our Bayesian filter 100,000's of emails and it has learned nothing. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Discussions, Exchange (PHES) Sent: Wednesday, December 13, 2006 11:08 AM To: Exchange Discussions Subject: RE: any anti spam recommendations We do. The Bayesian is the only one that requires training though. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Neil Doody Posted At: Wednesday, December 13, 2006 9:21 AM Posted To: ExchangeDiscussions Conversation: any anti spam recommendations Subject: RE: any anti spam recommendations Bayesian is a small part of spamassassin, you should look into the additional programs you can run along side it such as DCC/PYZOR and RAZOR2 all have checksums of spam from online databases which vastly improve spamassassin, I don't even bother to take Bayesian under consideration and leave it train itself based on scores through the additional programs. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Discussions, Exchange (PHES) Sent: 13 December 2006 14:57 To: Exchange Discussions Subject: RE: any anti spam recommendations That's the way we do it here. We also use Postfix with the LDAP connector so that we can eliminate email not destined for a valid mailbox before it hits SpamAssassin. My only complaint about this method is the length of time it takes to train if you use the Bayesian and the method for training leaves a lot to be desired (you have to resend the message to a dedicated box on the SpamAssassin server. We are looking at Barracuda as a replacement next year personally. Bob R -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jose Manzano Posted At: Wednesday, December 13, 2006 8:53 AM Posted To: ExchangeDiscussions Conversation: any anti spam recommendations Subject: RE: any anti spam recommendations Hi Neil, How does SpamAssassin work with the individual mailboxes? Does it just tag a suspected Spam Email as Spam then you setup a rule in outlook to move the message , or does it actually move/deletes the message before it gets to the inbox? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Neil Doody Sent: Wednesday, December 13, 2006 8:43 AM To: Exchange Discussions Subject: RE: any anti spam recommendations A unix based front end with spamassassin is good, you mention tech support so if a work out of the box with no requirements for some level of techno savvy configuration then it is probably not your best choice, but it is a very good spam filter. Something that may be more useful for you is to look into greylisting and SMTP banner delaying, greylisting says go away and come back later to the first attempt of mail delivery then allows it in the second attempt, SMTP banner delay just sets a delay before giving the 220 ready for mail banner. Using both of these methods stops spammers who are looking for a quick delivery and most wont come back to attempt a second delivery, stopping the mail coming into your server in the first place. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aristotle Zoulas Sent: 13 December 2006 13:29 To: Exchange Discussions Subject: any anti spam recommendations Hello, We are running Exchange 2003 with a pair of front end GFI Anti virus/Anti Spam servers acting as SMTP relays. The GFI products really are not enterprise grade. They are difficult to manage and have horrible tech support. Furthermore, they do not perform as advertised. We are looking for something much better. So far, we have looked at BrightMail (seems to now be called SMTP Ver. 5) and the MacAfee appliance (Secure Internet Gateway). We are looking for something that does not require constant tweaking and maintenance; something that would give us much better anti spam results. Our mail volume is anywhere from 500,000 to 1 million emails per day, of course 98% of which is----yes you guessed it SPAM! Any feedback from the list would be greatly appreciated. Aristotle Zoulas _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. 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